Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a40118575a6ecfe…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 19:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0090bbd001fe579ddafcefbbe0eba057 SHA-1: ee43b032eeefc6e43c7ed702a724c7da14814fd6 SHA-256: 5a40118575a6ecfe407ab8fa84701f52e8f44f88a9704293c41290dc4b1db92d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The presence of a large number of external links, including a link farm heuristic, suggests a deceptive purpose, possibly to manipulate search engine results or redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=annamalai+university+dde+books+download+pdf PDF link annotation
    • https://tavulejitozusol.weebly.com/uploads/1/3/0/8/130873759/8286400.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/suzodewapogojuz.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/84359523421.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/wonixop.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/visabuvowizadek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de10180e-059d-46c2-9a3f-2a1ad69dda63/do_bomb_pops_have_gluten.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_d8c4d8ce65494fa39b0b2e58037f72ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/klasifikasi_cacing_tanah_menurut_ekologi.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_906c48e7bc8142149f305de28a5bac0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b914d54-6f35-4c0f-bcec-2106403dadcc/wufodunizugaver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff52c6c-a7c0-4412-baf1-6ef155a498dc/what_do_mayan_symbols_symbolize.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_e12c362a83ba4645bf9fd3d5310967eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninazarila/wopado.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_bc1078d920594ffc8fc3f1d5ff106e37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/jaleduvo.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_d368e852d950468f9527197633db02ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8b1372-2743-4903-9750-4d4b1c8f7448/how_to_add_a_photo_on_top_of_another_photo_in_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/android_version_codename_and_api.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_b5f6d728e1f9436b85639578419d43b4.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 5632 bytes
SHA-256: fe2b6fb9a7f35637f41f975301205605d4b9eec1235cf5a11ba7a28ae0a02f05
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 11048 bytes
SHA-256: 7fa63a0ed2659ba77ad7a496705541de87326200b26f4f689ced4c642e8de89d