Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57628752e6af78c…

MALICIOUS

PDF

70.8 KB Created: 2021-02-26 03:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 441ece0128b2fb04517f977c42ad1490 SHA-1: 9e0de0ec21aaa697d7e9a70ff533c9001601a14e SHA-256: a57628752e6af78c5d7a1bde70369d32de9b05dd2f8068b8256e85b894a48a21
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'yafferge.ru' as a known malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=cyberpunk+2020+rulebook+diversity In PDF document text
    • http://tendernes.ru/gepisutetipovezibobetubck7zu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/gdb2Tje/jifafoxibemejasegete.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/12117905710cxc6r.pdfIn PDF document text
    • http://duwajofov.iblogger.org/wurobu.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/wgcghOm/gitogetab.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hhih0t0/zevogekapezebodapaniti.pdfIn PDF document text
    • http://kernig.pro/zizorewixupawekk3uv.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/nNBgdjf/best_swordsman_anime_series.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/nHif9hd/63935866687.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/befhdYT/dallas_indoor_skydiving_experience.pdfIn PDF document text
    • http://repair-planshetov.ru/1932580992805xag.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/sibhg10/favorites_no_bids_from_ebay_auctions.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/dCjfT2C/42733409557.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://nojimaduxonariz.rf.gd/accc_guide_to_unconscionable_conduct.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/cartoon_sound_effect_free.pdfIn PDF document text
    • http://jezawirigi.epizy.com/jomesudiwolovirelolima.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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5288 bytes
SHA-256: fb21f82b59053ea7af72b97b69c34762666f3f8b6391aa95903eccbe4083595e
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 9876 bytes
SHA-256: 276f13d6115cdcaf89d74120fb26e7d782be764f18cf300d0503ff8256d446d6
font_02_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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