Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7fe10c35e25ebf…

MALICIOUS

PDF

82.6 KB Created: 2021-01-15 07:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ba69b631c3e3fe019fe0fbd7ce6e41f SHA-1: 9e799a7cce47c9507dc8ba38376f8f3756d74a7d SHA-256: 8c7fe10c35e25ebfb594ec4b59a63b98416e8ba20ed8ff32b425ffc211de3fad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document functions as a link farm, directing users to numerous external websites, many hosted on disposable domains. The document's content, though heavily obfuscated, suggests a lure related to 'sheet music blanket'. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffnew.ru/aws?utm_term=sheet+music+blanket PDF link annotation
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/9532661.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/pphaCfa/battlestar_galactica_commander_crossword.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jukiwoponosezar.pdfIn PDF document text
    • https://padomixuboji.weebly.com/uploads/1/3/4/5/134527159/takixefetuxe.pdfIn PDF document text
    • https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/nokeze-texeluzaf-fugunozimope-dubet.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/5221379.pdfIn PDF document text
    • https://site-1191354.mozfiles.com/files/1191354/dajekunatufagejofuzalozu.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/3575860.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/e2gjiay/tree_template_with_roots.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/1360939.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://s3.amazonaws.com/vokeri/26277101850.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/75053075626.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_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 5024 bytes
SHA-256: b8d304ca8caa11d51311e32f211f4cc0cd9364846f8ede52e458f0f145d5eefb
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 11432 bytes
SHA-256: 9426f8f560b8cd57c933da4f66a690d7cd8ff892c72fc3bd2fd3339e0e5dd702
font_02_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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