Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ac57f4d33e8def…

MALICIOUS

PDF

78.2 KB Created: 2021-01-07 10:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b69d1fc652efa2046dfa2a308677bca6 SHA-1: 7aca54d8a66767566d654a56f02ae65ad01791e7 SHA-256: a7ac57f4d33e8defba5fb0de75520346515d3d1bfa97e279e0d302fd3d3d754b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms and redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and ClamAV detection confirm the malicious nature. While no scripts were explicitly extracted, the structure and embedded links strongly suggest the PDF's purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=the+100+characters+ages In PDF document text
    • https://cdn.sqhk.co/wikelere/OUgjgcn/best_compound_bow_target_arrows.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/81a5b4fb4.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/wetosuzeli.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/273c6f5.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/lagawiritojor.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/b5c531b5cf.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/jbz1jie/how_to_bake_sweet_potatoes_in_microwave.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/ihihfgc/63245937978.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/bukenuzodabuwuf-wisidow.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/Ijfllgf/huey_helicopter_rides_dothan_alabama.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/3ofKy2z/blackpool_tower_ballroom_afternoon_tea_dress_code.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
    • https://s3.amazonaws.com/farezelof/word_2013_alignment_guides.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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 4696 bytes
SHA-256: e996b36e17c0a603b98036f57bf51f22b6d2d5a8c1193ea8513517c7f85e69e0
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10204 bytes
SHA-256: 6717bbea69e6d24822becc774d9ab6d978a9926d5762436afe574780a8ec4623
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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