Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53e1156e28df3d4…

MALICIOUS

PDF

143.9 KB Created: 2021-03-20 12:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2116f5f88a0b0c34a885691acc3d4aa2 SHA-1: 0c3bc15894af2c2fe33043b1517baa200257e4da SHA-256: e53e1156e28df3d4e6518134e6b17dc7cb655a3f4dd3b5f6d57be4c02960dcc5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, suggesting a tactic for SEO manipulation or payload distribution. The presence of multiple disposable hosting domains and a high density of external links further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bexemusu.mypressonline.com/61272308453.pdf In PDF document text
    • https://cdn.sqhk.co/bezugisav/hbhcQij/best_craft_beer_selection_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/aFghxhc/ritujazulizi.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/Fhd6eUK/11041111957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_601a3d782e427.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/iaiczii/jepabizufa.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/alimentacion_correcta_definicion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473654/normal_600967e43bfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_604b38ddeaea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5fd70a0711213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5fe56a131bc7d.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/6206871369.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/86530187558.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/uThgr37/28844991197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=we%20are%20all%20completely%20beside%20ourselves%20by%20karen%20joy%20fowler%20reviewPDF link annotation
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_1f6f9fecb6ec48ea95fcafd47f026b07.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_38df45b488ed4bec9d1318a82285246b.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_1c72d1317920437ba37837fdafb716ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/plant_transpiration_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/gezoruwevorixotate.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/brooklyn_nine_nine_all_season_kickass.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/sears_kenmore_grill_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/can_you_cook_chips_in_an_air_fryer_without_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/bol_radha_bol_song_bestwap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E13F 5848 bytes
SHA-256: bbc5daba02e4d98fc12bcae610f2b40b55e0453a5e5a81f8b505ccdb0f69d0f7
font_01_sfnt_off0001f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F535 11660 bytes
SHA-256: d6062930f32183062f94980c8f22f8de991c0d69622f01ed54245f37141197e9
font_02_sfnt_off00021c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C96 16060 bytes
SHA-256: c15b8fed3370d5d9b987df7a0c7ebde5843bea61e82dcc8c8fb7e227171fd544

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