Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab73a2b42bfde9b3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-22 17:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1799dee1e1481d5f25eca3054eb51ce1 SHA-1: eafbb16831d351b946b5c21b61ca4e20a05bb721 SHA-256: ab73a2b42bfde9b39c6c317926d41ced7d116ed5ff262a1887295437c8f67613
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to transferring phone contacts, which is a common pretext for phishing or malware delivery. It hosts a large number of external links, many on disposable domains, indicating a link farm designed to distribute traffic to various malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user to these external resources.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://fokemale.ru/strik?utm_term=how+to+transfer+contacts+from+lg+phone+to+sim+card PDF link annotation
    • https://lubexunomug.weebly.com/uploads/1/3/2/6/132696146/fukane_ripexig_rikebe_xesoxe.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/vovope.pdfIn PDF document text
    • http://bupro.asia/bissell_carpet_cleaner_parts_near_mefmicu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_60344671101c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5ff85dfa81fc4.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/43421404624.pdfIn PDF document text
    • http://tehnoprom.org/tamil_new_movies_hd_printspz6g.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/filumipirobusu.pdfIn PDF document text
    • http://winclean-shop.space/search_google_or_type_a_url_meaningv83ls.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/jomiwarevimagexazurax.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/333991.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/kejofipozapapozol.pdfIn PDF document text
    • http://xozonline.ru/dutukakuludev508us.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/20670728997.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/24911601667.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/takexodes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494138/normal_5fe0cdc5d784a.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/94856eb550f246.pdfIn PDF document text
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/d11d1656c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/tanesafowevifeno.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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5624 bytes
SHA-256: 931493e9cacd33a664d5da9b9ea996b3a5773f0c14da4dfdc324300b956a7e3c
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10792 bytes
SHA-256: 8c3a496b788d6e60ed054e10d79fc66c12b24bbfd8a2a84ef17960a5628a4ebb