Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c10f4615f8ea246…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 16:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e29afa619d346ecfdf986dff248202f SHA-1: c60de3099fd61ec0a85b362efebed29bbefd3b36 SHA-256: 1c10f4615f8ea2465bfdb3d8f54e73515471950538737137772744479017556c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm distribution. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to drive traffic to a network of sites. The document body, though heavily obfuscated, appears to be a lure related to 'Huckleberry Finn' to entice clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=huckleberry+finn+summary+chapter+1-16 PDF link annotation
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/1160772.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuzorumuji/j1icQew/lewisuvupuzofewokosozezu.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/vPChf8M/91528982650.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/fNkieLh/debavawipobakunotowulale.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/dujegdp/navneet_nishan_spouse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fca563c0c877.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/jU8igjj/gokomigolepogizawepevuvas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_603b978c8621e.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/1771d.pdfIn PDF document text
    • https://jonokerozub.weebly.com/uploads/1/3/4/7/134714828/1857090.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/jdidvEm/38620327841.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/hJhjVBR/77655344683.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/gkgihhh/star_trek_timelines_voyage_rewards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6022cc39e02e9.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/6613194.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/fexuror/ravesetujevomafelifif.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/luvotilagogukerud.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/puwegotagokusigofal.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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 5532 bytes
SHA-256: 61312cb471ead66c0ee9077565136e0a8a3ec2e05c5780867fae1cab368bc03e
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10768 bytes
SHA-256: 29a50a54d381c7a520d2fcdd89f7f6904394a693aa96da42b755b9abe754b116
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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