Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b52a50faf4e844c…

MALICIOUS

PDF

69.3 KB Created: 2021-01-11 18:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 331cef956b87df0bfb18b7f16b15c599 SHA-1: ef103689fcf411b761ea9e84ef26747ef16dfba6 SHA-256: 2b52a50faf4e844c009b816b0106bb1096fa4e25a1e893d407b84cd80dfac009
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to various domains, many of which are hosted on disposable platforms like Weebly. This behavior is indicative of a link farm, often used to manipulate search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=medicinal+chemistry+a+molecular+and+biochemical+approach PDF link annotation
    • https://gorugofinugiv.weebly.com/uploads/1/3/4/3/134334376/lokarete_vokotobaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5ff7774345c1e.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/gidifaf.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/7566715.pdfIn PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/9852870.pdfIn PDF document text
    • https://site-1177931.mozfiles.com/files/1177931/gumalolun.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/6jeZghA/crude_oil_price_news_today_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/supopelax/iaviigc/mcvities_digestive_biscuits_1kg.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/verajaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/brawl_stars_pc_no_bluestacks.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/bethel_music_video.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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 5560 bytes
SHA-256: 766d11afad678931b50ba49255c306c882b5f25e43f0d092d84d8f35027eaa25
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10088 bytes
SHA-256: ef9b672d1c8790ef26bb9ca0ccc96866bc1ea4f9f59ba148d6c7a48f2b2984bd

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