Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c88fa573ce4963…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 22:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c3a9811f6f00bfe26543c88fbc29b7c6 SHA-1: 0d50aed67061cf569babffc1dbf78cd009c69e00 SHA-256: d8c88fa573ce4963e2c718ce0c30c8d2f6904ac2a47305cc7d38e19d5adf8000
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to '300 common spanish words'. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/aws?utm_term=300+common+spanish+words PDF link annotation
    • http://kisiguvawatabom.22web.org/bardot_dress_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ff713819bb64.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/medireseburosu.pdfIn PDF document text
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/girasub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392854/normal_6008b32b2479f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5ffb959f359e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fee26c34c01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_6031ed0d4d29e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5fed5d04c7877.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/vilonokoseles-volinafeveda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_602eb58e394e8.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/6f5a97943f5819.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/xufagi-lukunekuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolixegoxow.epizy.com/kadowas.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/invertebrate_zoology_notes.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/31217974018.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/pokemon_cards_online_games_free_no.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/detalefes.pdfIn PDF document text
    • http://nijugatujoz.rf.gd/levikokorubofisa.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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5584 bytes
SHA-256: 56c19ab5838c2463d9be46c48a4bf4a98185c2229bd88012b052518f12430a22
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10820 bytes
SHA-256: 15d9e21aaf0e20b6db3ef1c0c3210dc5dc04723b8af5279633065ded14c4571b

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