Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a47f67a0e2380ea…

MALICIOUS

PDF

93.0 KB Created: 2021-05-20 02:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c72d64cb462a1e4e16b135efd75cb81f SHA-1: df3435c0bf610535a5a853db557cccfe6e085182 SHA-256: 1a47f67a0e2380ead2351f27f13bc5e60f2482042dd07fae8bed0a617bda1f41
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. The 'rent receipt' lure is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, potentially for further exploitation or phishing.

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://soxebez.ru/strik?utm_term=rent+receipt+format+for+income+tax+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387412/normal_605d8fe41a1b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6035d3289d183.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/6073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_606e77d3b7ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_6056c304ec287.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/pukin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6019c519ab844.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/4f68a73e5.pdfIn PDF document text
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/zigewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_603b4d96a3405.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/1032160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_604b69ed3ec46.pdfIn PDF document text
    • https://detiloxobaz.weebly.com/uploads/1/3/1/3/131398171/zidevaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fcdaf6f89549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_6032e81d58ac1.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/9122004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6018ce59eceef.pdfIn PDF document text
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/waxegetoxevisuk_jujijixanomer_liwilunufezuxak_betaleniw.pdfIn PDF document text
    • https://pixereboxos.weebly.com/uploads/1/3/1/3/131381799/1433948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 5292 bytes
SHA-256: 5c04bf4a2f253093bdddedf4fb31397a66ea301c60916d5425db3e2382684fe4
font_01_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 11380 bytes
SHA-256: e7835f75b3e92022fc1848a594a8e9c84439fe0cf1a4431611964fa0c7dd08c4
font_02_sfnt_off0001518d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518D 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7