Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc78812eecd0fc7b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 09:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a1780a52e0fb4e28d2330e198b01bae9 SHA-1: 557d0e5d7fa9a1beda318efa102a01d601f6e09d SHA-256: cc78812eecd0fc7bcf7101761075d5bd684b84b9317fc5a15f63279e565a6db9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to potentially harmful content, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://bologen.ru/wix?keyword=compass+group+drug+testing+policy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602021372e673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_600fae528eb59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_600ed176d62ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_604242836e474.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/jerasovizijutaxe.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/ages_and_stages_of_development.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_60462b0ab9f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_601f2d511894b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_601481b719c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6044d392f34f2.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/5414318137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492294/normal_60016b71b0460.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/c23d753b-9c14-4f82-b473-c5b77ccdcaaf/where_do_you_first_start_losing_weight.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_ac869074a6804403a3dac7cd27e06e1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f3a485-a964-4ba1-8936-9160711d860a/64021948709.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_221e7060f51d4f26bc1d5dc3a5c8f7ff.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_e7fa6cfd0def4f83a924febc8b6bf88a.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_ed4cca33c5894f29b272f45d2900af41.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_e2ac8451185d4d08b30efb92278a46f1.pdf?index=trueIn PDF document text
    • http://jefiwimagi.epizy.com/90904093467.pdfIn PDF document text
    • http://toridefe.rf.gd/spider_man_2099_comics_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbcfe34-a5d6-4f02-89c8-e58601a48e89/98467726072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd165cd6-7987-49d2-9076-e8aa3714dbd8/english_phrases_with_urdu_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c44da6c-054a-44c7-b97a-134e1dd65cef/sat_practice_test_5_khan_academy.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 5400 bytes
SHA-256: 8b70d727e68717433bcfc3a33c8903d5ef5eb4ba60e03a83c40d1940c8127acc
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 11140 bytes
SHA-256: 63497c37babf4803658bc395c066adc2a5fc47e8d58ee6c39dfcaa08c7a605c2

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