Malicious PDF — malware analysis report

Static analysis result for SHA-256 59445900c2c4b1d0…

MALICIOUS

PDF

89.1 KB Created: 2021-03-01 01:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7968061578fac34ee14306ef904d5f3d SHA-1: dec0def67403be936103baeb5525e138c62029b1 SHA-256: 59445900c2c4b1d0a88834cc444fe5b58e3ddeef323abb45c212366dfd6a4273
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier strongly indicates maliciousness, and the heuristic for disposable link farms suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://pelibifir.ru/123?utm_term=how+to+thread+a+sears+kenmore+sewing+machine+model+1120 PDF link annotation
    • http://potenciy.xyz/bifawubedonuraturavujiwytod4.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/gjeib41/66175128937.pdfIn PDF document text
    • http://cadenalia.com/tour_the_galaxy_stoooms8.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/a1ifgQa/contract_killer_zombies_2_apk_hack.pdfIn PDF document text
    • http://winclean-shop.space/82521752201gz30i.pdfIn PDF document text
    • http://cmbmarketing.agency/nys_junior_drivers_license_restrictionsckxnb.pdfIn PDF document text
    • http://thelandofbadideas.com/gupiwupizhxllg.pdfIn PDF document text
    • http://lami-lashes.site/73596823430lcvdd.pdfIn PDF document text
    • https://rikolalevagamer.weebly.com/uploads/1/3/1/1/131164452/5155061.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/PhckkOC/61955464849.pdfIn PDF document text
    • http://keto-menu.online/20471277103ds9fk.pdfIn PDF document text
    • http://damvglaz1.xyz/advanced_formulas_in_excel_2013ebxf6.pdfIn PDF document text
    • http://whitecheat.xyz/can_you_do_a_psychology_degree_onlinejwozr.pdfIn PDF document text
    • https://cdn.sqhk.co/waxixojapu/3jaiihV/11254208192.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/i6jheqK/vogesimuxekavuji.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/dvuwZgj/laxowugiwosajom.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/w3shahh/pojajezawuwe.pdfIn PDF document text
    • http://prizinsta.online/59653418592y1quz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 5796 bytes
SHA-256: 4abc525561be68c9fb1c605cf009974958f379b3f6c1d83962116da247d3e90b
font_01_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 11032 bytes
SHA-256: c6cc83f56ad726eb0d6db28cc95799cc70f61f7d1b027bdf7adaf08d11e62819

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