Malicious PDF — malware analysis report

Static analysis result for SHA-256 5add8bdf30f3ba13…

MALICIOUS

PDF

64.8 KB Created: 2021-01-17 08:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d3bde52ca733e0ca9ca031fbdc3e70f SHA-1: e7a096249b6e316d1800f50baa0df6f5824538bc SHA-256: 5add8bdf30f3ba131a199a1b43c25262ad22ec6bc09bfb8f2f1e9fceca137bb9
184 Risk Score

Malware Insights

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

The PDF document contains embedded links that point to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to 'trig functions worksheet with answers'. The presence of multiple disposable domains and Weebly hosting, as indicated by 'PDF_SEO_DISPOSABLE_LINK_FARM', further supports a phishing or redirection scheme. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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://ggtraff.ru/123?utm_term=exact+value+of+trig+functions+worksheet+with+answers In PDF document text
    • https://wanalepawipetep.weebly.com/uploads/1/3/1/8/131857983/bates_zazipepil_votegexova_wotesub.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/hbugeif/99538451703.pdfIn PDF document text
    • https://site-1168358.mozfiles.com/files/1168358/fubopemataxavufavaj.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/10553583999.pdfIn PDF document text
    • https://site-1205711.mozfiles.com/files/1205711/gallery_picker_intent_android.pdfIn PDF document text
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/fojagemovomodipow.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/asteroids_belt_facts.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/70532711676.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/7720692.pdfIn PDF document text
    • https://site-1252685.mozfiles.com/files/1252685/bunuw.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/46323172187.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/fist_of_fury_1995_cast.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/jixerubowi/baberegidufelagakeri.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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 5384 bytes
SHA-256: 5ab4bd20fa55a3911515590ac9e97ab63959d70ce7dfabf86b40dc80538c9824
font_01_sfnt_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 10252 bytes
SHA-256: c119107038c365d622522b1e0e1a8248414ed25254ae70e1fb2238ef61373dcd

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