Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2fb30911f88d78…

MALICIOUS

PDF

68.8 KB Created: 2021-04-06 06:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6be567168af331ec4fb15ba87816cf04 SHA-1: 03af2872270c07f25b070186a79721e1c0199c08 SHA-256: 2f2fb30911f88d78c275c9ecc8c8be9fd0288e226c19cfd5bc6023855a4a0e39
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains a large number of external URIs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of numerous external links points towards a potential phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=economic+zoology+shukla+upadhyay+pdf PDF link annotation
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/9257182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_6012797c7b970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_603ed938b6735.pdfIn PDF document text
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/mozomunadugezuxexal.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/a6da9536.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/536e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_602b6a91e339d.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/leraliwude-duzorunozu.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/fodaxomadejuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefesati.rf.gd/80545903631.pdfIn PDF document text
    • http://falowowujozaba.rf.gd/sitepinopakenoxaxitori.pdfIn PDF document text
    • http://gazinuxifo.epizy.com/the_hound_of_the_baskervilles_movie_free_download_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4125eba-5125-4422-808a-4dea1c59b632/how_to_change_rapala_scale_from_kg_to_lbs.pdfIn PDF document text
    • http://bejopirobi.epizy.com/afterburn_sylvia_day_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ab1878-cccc-4710-981f-5ed1fb222ab4/nixon_sentry_leather_gunmetal_watch.pdfIn PDF document text
    • http://ritarajekaxitev.rf.gd/anamnesis_sample.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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 5644 bytes
SHA-256: 2f55565692284c5020bb382ee4ddfa5069df1b54fd7a4cd64205047d2b058175
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10464 bytes
SHA-256: bb671ce35c80c346f92087331e727f5e1b17c628e9c9b9a4f6714aef1cd78284

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