Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97594f25663ab6f…

MALICIOUS

PDF

77.4 KB Created: 2021-06-06 09:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ffda72b6ba4873e5a20058a8a9a99884 SHA-1: d4f32b2ff3f3bece83c99f0aafd57cdbee4b47fe SHA-256: a97594f25663ab6ffb0dc8a4cb8ba1a0ce954c0c33684972cfb504d58e584558
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9998

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/pbw?utm_term=where+can+i+have+a+passport+photo+taken+near+me PDF link annotation
    • https://jirakevajiw.weebly.com/uploads/1/3/5/9/135966085/6171b75b95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_604f730156917.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/sizojipeberere_peminuker_xutekeka_zebujizugukuril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_605d81a1b30a4.pdfIn PDF document text
    • https://sogatawinasefe.weebly.com/uploads/1/3/4/3/134327891/pazodegofukafaxotaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60476c93d5313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_600bcd4578b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_6036d997c1c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_600bb98bba321.pdfIn PDF document text
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/5776546.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/7569183.pdfIn PDF document text
    • https://lamuvoraraxuz.weebly.com/uploads/1/3/4/4/134486612/didumusawetubofijaw.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/5105165.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/voxokexezida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunozulig.pbworks.com/f/vpn_unblock_proxy_apk.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144615273/71628356875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc8eb90-b0d7-4d1c-8a66-4566d2650af4/fifevoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0d5146-69f6-4b6e-ae85-a2e8838eeadd/raven_cruizer_ii_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185cfb34-2282-4c6f-a22d-424e85bbaf5c/joy_to_the_world_chords_key_of_c.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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5276 bytes
SHA-256: 3242383eb07197066be5c292ab55b7529012e170d8e631e6289fe5cd450c9809
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10640 bytes
SHA-256: ef056476e734bbe451eec03c210e03088556d70c2dfcc32dd4a7ab93bbef4cd9