Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e29b5b477b82cf…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 14:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b52590a24a3004de833c6b02b9dea323 SHA-1: 9cd4fd046805be19a48eee182b70010fff9b7b9a SHA-256: 40e29b5b477b82cf6fb942c4b7ffc8ce7def1b6d54164d049d3a6b34bdc1960d
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/aws?utm_term=bosch+silence+plus+50+dba+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ffc29fa3c72e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_604144e4796c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_604d13532338a.pdfIn PDF document text
    • http://marketitaly.pro/assessment_report_pec7cruf.pdfIn PDF document text
    • http://onlinekartiadesi.com/92867533874gdz0t.pdfIn PDF document text
    • http://hackins.site/oracle_sql_query_date_between_examplegv4r4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_600cba82bb717.pdfIn PDF document text
    • http://kotodagojaf.iblogger.org/pigejegilasofagan.pdfIn PDF document text
    • http://bnatural.space/fizz_ap_guide1xyvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5ffa864a82cee.pdfIn PDF document text
    • http://cpskras.website/fogelewune4mm6i.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://uploads.strikinglycdn.com/files/cd7d9725-aaa4-46bd-9490-7eee64207588/medios_de_comunicacin_interna_en_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7c88f1-ca95-4bea-afbf-ade6a3db5c34/garmin_dezl_570lmt-d_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86117db8-c10f-45ee-ad31-4b61cb167f38/what_does_wild_hog_taste_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3672a1-a90b-4569-82aa-1b31561378ac/80918205942.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_760381e892a14ad9a9ebe8ba55d01b0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3182f76a-1f54-4891-9f89-cde8c4e38094/balzac_and_the_little_chinese_seamstress_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f2fc23-dad0-4b78-97be-5ec011be63fd/childrens_bible_story_videos.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/bumuwatujuvuxegu.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_a6ffa526e487481ab5916a90b42bdd26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71eb067-9b47-4db5-91bc-1f65d501d932/pugokaxubefita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65d865b-1672-42d8-9e8f-6a54a7276df8/76459155417.pdfIn PDF document text
    • http://texokobatogu.epizy.com/69069833117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908e1e3d-1aee-4612-b0c9-873ae2e47d55/testing_throughout_the_software_life_cycle_ppt.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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 5572 bytes
SHA-256: a1aec5b2a836e18729e6494d8663f726cdc0679a6c15faece76892239e2d283f
font_01_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 10784 bytes
SHA-256: 3a52a2b09a6b2bb6d9890ddc07af24ed43fd0f7b37bb92321ff87d02975cc45c
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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