Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb45d73317988ea…

MALICIOUS

PDF

87.7 KB Created: 2021-05-07 08:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 14bd414cfaa86f42a400041c07ef0df7 SHA-1: 0831fcec22efc2fd621244f1c4500dbdca5ebd19 SHA-256: 4fb45d73317988eaa9ab655dc78758a8fffdf780f430bd386885b0579b19e37b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary external links is to `https://jacksth.ru/strik?utm_term=how+much+are+honda+civic+wiper+blades`, which likely serves as a redirector or landing page for a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is being leveraged to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=how+much+are+honda+civic+wiper+blades PDF link annotation
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/terulogi_leden_tigaso_guzoja.pdfIn PDF document text
    • http://liketime.fun/nawijusuxodanezixelufxz411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_604d081523f0f.pdfIn PDF document text
    • https://wakabidodez.weebly.com/uploads/1/3/4/6/134632857/siwekukazoli-nazorore-zigemonug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff612afa73bf.pdfIn PDF document text
    • http://afracheat1.xyz/first_person_point_of_view_worksheets_6th_gradeus5jf.pdfIn PDF document text
    • http://kreativoblako.com/continuous_probability_distribution_worksheetomoez.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/eac9264dc1b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b76b1e13-9117-4177-bcd5-290b6ba37082/how_to_use_water_softener_pellets.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_70e8ea090196498492d70059047c4c5a.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_50dc07032daf4479bf487520e60d7d79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de2a7e4-57f8-4a7a-a320-c9479c98c2ee/graco_pack_n_play_care_suite_playard_assembly_instructions.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_b3cca59f3568457e930dd7ee98e2878b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45bbcf5e-1875-4926-be37-27010aee3d66/possessive_pronoun_exercises_online.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_07c1a7e9d71140f68de0cad5a6ac2a52.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_f99f8b6a6e984e3b8d4c269868794313.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_ed99ed4e58b64d7491ffb860347b06fb.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_e0554026c0a94751b993afe610438a67.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_e58f4a4ea687422f9c401e6c27a644e8.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_f8d557e6d66a48efac6ccc03cb126a07.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_209fb714cf1640ac9a5a11e38027edd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff38207-418a-4512-ad7f-2f7d4f709320/descargar_firmware_para_router_d_link_dir_615_t1.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 5368 bytes
SHA-256: 0c7471eafef0ba5d418c3faf7742440ff189d5aa8c59773eeb137c6417d3d361
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 12044 bytes
SHA-256: cb9b8a5a28c98631f65454180613da9660cfe4c29e2453fff1c445849b7db9ae
font_02_sfnt_off00014317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14317 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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