Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf60b39d6c6f829…

MALICIOUS

PDF

72.2 KB Created: 2021-01-05 04:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 11a59f7bc08c2bafee45091b5fdd964a SHA-1: 98bd507568270fbd975f2536bfff33fca0181472 SHA-256: 2cf60b39d6c6f829debeae377cc5caf72e8fd2a96824aeca1854508fce54eb7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://traffking.ru/aws?utm_term=common+polyatomic+ions+sheet', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

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://traffking.ru/aws?utm_term=common+polyatomic+ions+sheet PDF link annotation
    • https://cdn.sqhk.co/mawejoxejobe/jhifhi3/65174818510.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/ggmThdo/vipon_deals_coupons.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/bavafumerutet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fdf5ffb97598.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/d93b6d3775b9f0.pdfIn PDF document text
    • https://modizotu.weebly.com/uploads/1/3/2/7/132740501/rumaweje-kizaxar-foxizituzu.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/iFjiija/chronology_time_changes_everything.pdfIn PDF document text
    • https://cdn.sqhk.co/mapibeze/6xgijiT/daily_checklist_template_word.pdfIn PDF document text
    • https://bomitepoz.weebly.com/uploads/1/3/4/8/134895739/varudolapuvifo_xilanerekoloji_vavabozawo_duzov.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/7534878.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/ihicohb/gp_sheet_weight_chart.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/posufij/introduction_to_bayesian_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f1c7cc-4ea4-4048-8d12-ed28f2a183de/examples_of_curses_in_the_bible.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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5084 bytes
SHA-256: 1bbb9d0d35f85a30b90ee26090d46c554bbb11c469481467641176928e467ebf
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 9900 bytes
SHA-256: 4f6d76e7801d6e321de64c1bc85317302107e9f92ebd16c50559bf9f2cc8290e

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