Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af921bcf9c7b27…

MALICIOUS

PDF

80.3 KB Created: 2021-02-20 04:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 160c26ed449c13d2ba22e1947c059725 SHA-1: 71cc65122df890f229784f367328b818f94f9b89 SHA-256: 97af921bcf9c7b27be833afa1879da49cc6a7e46ad7a15eeb25b34258e7e9a20
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, designed to redirect users to potentially malicious sites. The presence of a redirector link to 'yafferge.ru' strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=ridgid+10+sliding+compound+miter+saw+reviews In PDF document text
    • http://roflan.site/vupuzepizawazurugbiux.pdfIn PDF document text
    • http://natur-bio.space/regional_geography_of_canada_7th_editionr0g7t.pdfIn PDF document text
    • http://biomaniks.website/givozesobojufejig2vl2j.pdfIn PDF document text
    • http://hookup153.site/group_theory_in_physics_tungyd5m8.pdfIn PDF document text
    • http://rusakova.space/voice_recorder_software_for_pc_windows_10965gc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ff4b33e36dc5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/dRghhcH/global_citizen_festival_2015_beyonce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5ffbadbd60123.pdfIn PDF document text
    • http://gnoogle.site/xutigususiliwuvokefcqo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450256/normal_5fedcc5ff0913.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/cXighgZ/74512744918.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/ibFifXP/how_do_you_rat_proof_a_chicken_run.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6020d5207e4b3.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/64ibrHM/mimpi_digigit_ular_putih_di_tangan_kiri.pdfIn PDF document text
    • http://shoes-storie.club/pugavakj93r.pdfIn PDF document text
    • http://fenotowibezusen.iblogger.org/83847904012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wefazerigibu.epizy.com/11297173535.pdfIn PDF document text
    • http://konemuga.epizy.com/94198369666.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/fibajitifofisekubesopage.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/l_apiculture_illustre.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/lokizuwupudadumafe.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5628 bytes
SHA-256: 5aa93154f06e8289ab0ad96e7671c8ae3d6d46851e12d60868e4840455c82ccf
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 11360 bytes
SHA-256: 2db0f31ff7575e7a889ddf8140ce7ce10b7929bdff8092fc650fe9edc3cbc8c9
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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