Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aab1b8a8510ae72…

MALICIOUS

PDF

73.2 KB Created: 2021-02-13 22:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 39f6bbc27d9708c97ea0b9a8ce573a07 SHA-1: 9a5a3d978d6cca556c2033ab3461912125d66aac SHA-256: 6aab1b8a8510ae725361b873f0ed0ac96a643dfbd2572635c2a91b1584b13c23
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with many pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious functionality appears to be the extensive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/aws?utm_term=booklet+cover+design+template+free In PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jOjcKJo/ninjago_time_blade_sets.pdfIn PDF document text
    • https://cdn.sqhk.co/gobejilu/icgcjgf/97562687136.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/jobamisunetube.pdfIn PDF document text
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/a599feece3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5fe9296de140a.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/bBLRidQ/nursery_rhymes_songs_list.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/558711.pdfIn PDF document text
    • https://tezogikezuvar.weebly.com/uploads/1/3/4/5/134584113/lipejuzaluse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490934/normal_60066765c4a7d.pdfIn PDF document text
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/17f3d9.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/figofot-dakeririjenef-poxobubijujabo-zafazik.pdfIn PDF document text
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/xitenejede.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/9397238.pdfIn PDF document text
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/724216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fde57eab2b9a.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://zasegusof.epizy.com/nagugamovuduzal.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/mtg_vampires_sideboard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/kerboodle_answers_physics_combined_science.pdfIn PDF document text
    • http://pevivudawof.epizy.com/7354885833.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/rooted_android_phone_means.pdfIn PDF document text
    • http://goseletew.epizy.com/android_app_development_programming_language.pdfIn PDF document text
    • http://labomodofu.epizy.com/kapegir.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/expected_credit_loss_model_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/tibia_imbuements_guide.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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 5436 bytes
SHA-256: a78005aeabc55d628550e4844d6f79744aa1668cebd285f34d0bee35ed677ca5
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10440 bytes
SHA-256: 2fe4c2fe0c6cced08fd4b3268dc4b49df8847f3922610645593dcc5312f2ce11
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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