Malicious PDF — malware analysis report

Static analysis result for SHA-256 df429709f5188775…

MALICIOUS

PDF

84.8 KB Created: 2021-03-09 13:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a15fce5bc0b6c3ce3952005ae0e5b0d7 SHA-1: 5b9139a8dd3035e63f9201d28159551880716c70 SHA-256: df429709f5188775d0cb36114cb3e635ed8d6a4a700b9a76c41e4d8f993655b3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/123?utm_term=grad+school+resume+guide PDF link annotation
    • https://cdn.sqhk.co/koditisalupe/jcvj1gf/4_pics_1_word_4_letters_cards_judge.pdfIn PDF document text
    • http://xesesevatep.22web.org/android_google_sign_in_failed.pdfIn PDF document text
    • http://zufufamaz.66ghz.com/wanavokagojobajigivu.pdfIn PDF document text
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/kuwudedawufusifaxot.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/2kl7Agc/koxobajijin.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6NscTz9/how_to_play_fun_race_3d.pdfIn PDF document text
    • http://gikonifip.22web.org/xemar.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/zichjhx/maxi_craft_exploration_master.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisedopila/hcKRNhe/55787002145.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/ajcicbJ/free_homeschooling_programs_in_florida.pdfIn PDF document text
    • http://vejofewi.iblogger.org/50387614493.pdfIn PDF document text
    • https://xajijalati.weebly.com/uploads/1/3/3/9/133997138/bomafu-juwot.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/iuoij1L/64027364611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_618c4c8f4e0b4f0c902e3a6530b95443.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_401fc14417bd41c78a70d77ab2119f59.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_7f84697927a14a25974618214f8ee21f.pdf?index=trueIn PDF document text
    • http://sopigovo.rf.gd/catalytic_reforming_ppt.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_71d4695cfeb74880b09116ab23d50c9b.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_a2227a142f97419d8b8a1526e0c67e7c.pdf?index=trueIn 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_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 5384 bytes
SHA-256: 2dde00d2705b5386e55e8a312e77b3f710cc61ec2a05251adfcb838d852df34e
font_01_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 10824 bytes
SHA-256: 81b30805c31b8290820ba89bea8426095a007db1bbe0043a814fd7d658043c62

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