Malicious PDF — malware analysis report

Static analysis result for SHA-256 881785c48c5c9118…

MALICIOUS

PDF

109.6 KB Created: 2021-05-30 18:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69d39faf4fe872bee79fe7bcdadc739b SHA-1: d97ce557aafe0845380950c5c90f7155c73395d7 SHA-256: 881785c48c5c91185b21ef801edaa9eb352e5110c505960ba8dcc87238de3e42
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=que+significa+el+sentido+de+la+vida PDF link annotation
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/9351c79109cdeb.pdfIn PDF document text
    • https://savuvudibifig.weebly.com/uploads/1/3/4/3/134328071/2527409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_600691607570d.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/6866113.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/680be55f.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/pafotekupudobapos.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/fanagoxana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_606c0dfe90116.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/3264762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_603e7eed2fb3c.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/zavilulepatepu-texapebipa-xediki-gisofamexifoji.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/1423505.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/gukawenonuli.pdfIn PDF document text
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/9018682.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/1203511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fc68eb3d19a4.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/9619ffd81d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feeb22195ce0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09602f36-08f7-4a82-8173-5dda4aab1b5b/27564015103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb234261-074a-4200-a069-4091e310d5b8/pobukuxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a2d962-6733-4ca4-9060-49d826cac633/vokelajivofemiz.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_off00015955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15955 5120 bytes
SHA-256: ed434f3410124ca51f06e0e40bf407459cbd1cb0d4a54a413abd19b95798ff89
font_01_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 5216 bytes
SHA-256: 3f6e427a0226ed6a17fdea8d39163fe4eb409de0602e9a23b6163c2762535ecf
font_02_sfnt_off00017d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D01 13828 bytes
SHA-256: 8c4733d156a68c198317c485164190cf45d7bf54088d93a3ba7a748479e5d2b7