Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c1cba1821d99a6…

MALICIOUS

PDF

76.4 KB Created: 2021-01-13 15:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cf4d61dcdf402c4566093c83f3f9a033 SHA-1: de58553ae5c81b19ea96b74ef9f530b96513a0a8 SHA-256: d9c1cba1821d99a6c81f7652c71c3f555674e77f1b1b6eeb113d96ed990f8cc1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text suggesting it's a 'secure PDF file to edit', which is a common lure for phishing or malware delivery. The numerous embedded URLs, many hosted on disposable domains like weebly.com and sqhk.co, reinforce the malicious intent of directing users to external, untrusted content.

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://trafficel.ru/aws?utm_term=een+beveiligd+pdf+bestand+bewerken PDF link annotation
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/463347.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/mifurefutu.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jfy33qA/valenikaxenigomodivexori.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/hGZjagi/marvel_unlimited_price_increase.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/b4cIche/likejedapuzebotojesirekuf.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/4d37e.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/xetavikudo_letunezeguv_roturopa.pdfIn PDF document text
    • https://bagekitavaseb.weebly.com/uploads/1/3/1/0/131070055/2847950.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/falesaxemarareb.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/81069982188.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/jPkjjif/recarga_facil_riocard_empresa.pdfIn PDF document text
    • https://site-1177982.mozfiles.com/files/1177982/mermaids_1990_cher_winona_ryder.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/V8ifDgg/anime_stickers_for_whatsapp_android.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/txZhhjc/31345399891.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/sixowijesa_kupenitalu_benebekejob_nebubawanaret.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
    • 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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 5200 bytes
SHA-256: 99f6f68a62190ba2acfeb7a914697eeb5f2237740e461919d510671d58f6d721
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11152 bytes
SHA-256: ee59c98ca322b2925b15ebd4097e3ec89ed724686d478b1da0dcc724685679c3
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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