Malicious PDF — malware analysis report

Static analysis result for SHA-256 187f01e583eb89a1…

MALICIOUS

PDF

74.6 KB Created: 2021-03-06 07:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2fe53b55374fb06e459ce698df91c58b SHA-1: 58cf915c60ee87108dacf63fabe591598b6bbe8b SHA-256: 187f01e583eb89a1c199667259f1305236f0fc346ccaccbeabeecd4a47936d15
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=graphic+design+jobs+salary+uk PDF link annotation
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/9935111.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/1000_basic_english_words_free.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/5783535.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/8608582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fe9ae959374b.pdfIn PDF document text
    • https://rujozakovupa.weebly.com/uploads/1/3/0/7/130776159/gobamuzepufa_kevopota_sogevovalegoda_vipevoxidevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fce1827b0a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6042cfe2a7403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60182ee6783a1.pdfIn PDF document text
    • http://zagunur.22web.org/14841113924.pdfIn PDF document text
    • https://vumokaxizojomij.weebly.com/uploads/1/3/2/6/132680848/wifenezoxe.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/jewabobanabekitujoge.pdfIn PDF document text
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/siduzifufanofipeles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_603348fde4286.pdfIn PDF document text
    • https://diwobubukabo.weebly.com/uploads/1/3/4/8/134875473/xasusifo_zanubosakotu_kofoniwebajupe_godomedo.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/4289174.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/tatabizafubas-koganerufi-bapifepapari-tadobelafesar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_602140b8234d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_734eccd6cf00436d91e99accfa61dbb1.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_87ad2e69a25c4e6d89b61a52a5071f75.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_79087d5cd02b441594bd9fbac305e13a.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_0559270b620148bf8d2f900b72a5cfd8.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 5748 bytes
SHA-256: 18741e85a4afa7e8363dcfbbfbe7497183dfe02b4f5fe90596c04ac9cea8dda1
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 10244 bytes
SHA-256: 91bec72797f33ddab108799437ba95333f5f9d0271c4148968ebadc41ecbc876