Malicious PDF — malware analysis report

Static analysis result for SHA-256 338c91b5c07e7c8e…

MALICIOUS

PDF

64.6 KB Created: 2021-02-23 04:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8fc061154263522c72d58464576382a2 SHA-1: 1c0efc5a4a8eef6cfea3d7590d4ba8b98ea078c7 SHA-256: 338c91b5c07e7c8eea9939be838f38eac8e7f40ee8cfb726f85a45ae255e4ce2
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=lesson+10.1+geometry+answers PDF link annotation
    • http://webpost.pro/383541222221uab7.pdfIn PDF document text
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/zojejogovuwobed.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/NnhRgjI/knife_sharpener_reviews_singapore.pdfIn PDF document text
    • http://togezapavux.iblogger.org/vagenotofobubegu.pdfIn PDF document text
    • https://sufivelogazawe.weebly.com/uploads/1/3/4/6/134600369/kujiralux_dokufubedeve.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/6830025.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Jjjgijd/peludu.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/a5408ce.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Cdhfwp2/xenef.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/BrbhcIN/birunutavot.pdfIn PDF document text
    • http://naturfresh.space/8556857993vckul.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/W2zSGxz/59122783896.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/jhrjehq/amazon_golf_grips_oversize.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/kgdkcPp/koaa_tv_listings.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/cheh4ig/dosimiweza.pdfIn PDF document text
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/nipunemizasise-ruderodoterar-xowojut-datusefara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatugawaxevi.rf.gd/mosojewof.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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 5336 bytes
SHA-256: 66092b67f452f9e128effc632547682912b756d0296735786e3d9973ebbe74f2
font_01_sfnt_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 10584 bytes
SHA-256: 7c4f6c20c7191dd8d320cfd96e1a971d2f09edec7ebcbabfae78d89e2ca26d36