Malicious PDF — malware analysis report

Static analysis result for SHA-256 8232aaccefbba396…

MALICIOUS

PDF

84.1 KB Created: 2021-05-28 07:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80fad1c6d0b6a001f234159c32c89a8f SHA-1: 79164845e42b84af6544dee965b7941ecca7360e SHA-256: 8232aaccefbba396ccb9dcd2b747c52bc2709c978a77e035416d3889aa1a8ddd
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious sites, such as the one at 'yafferge.ru'. The document body itself is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=vedic+maths+all+formulas+pdf In PDF document text
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/kudoziwiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_602172e31cc41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ff60707aabc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447085/normal_5fd02b7b9d5c3.pdfIn PDF document text
    • https://muvebodexiju.weebly.com/uploads/1/3/5/3/135311879/ee685dc37b4ee1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ff148ccc1717.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/3e89a1.pdfIn PDF document text
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/6917965.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/fasufina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_605f859fe5fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_600e3d47e444d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6036fff1a794b.pdfIn PDF document text
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/4aa87268724bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fdf39b6d314d.pdfIn PDF document text
    • https://dixamagajo.weebly.com/uploads/1/3/4/6/134652312/6919716.pdfIn PDF document text
    • https://xikoxuzit.weebly.com/uploads/1/3/4/6/134632277/jiliwebi.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/6329221.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/gaganefurexefu-taputix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_60543d6952a90.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/nojodaderoda.pdfIn PDF document text
    • https://wosodaguv.weebly.com/uploads/1/3/4/5/134590300/gavoluluxade_sijarowowuguno_tepigowokower.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_600f590d8a505.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/pasipawefupak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b495d27f-6f07-474c-87e0-0c266aa59498/lux_tx500e_thermostat_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effa966a-a6c2-4677-85d5-dec9b9c8a783/dugimozo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 5136 bytes
SHA-256: c57f9eb69b1736398a0ed6de9cfbe9319a11e56d5e61db7b441c7e5a71d5fe60
font_01_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 10672 bytes
SHA-256: cc95545364b86b8f6864e6ed251edc6ab952c00cec217e3d05f30bef60ba071e
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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