Malicious PDF — malware analysis report

Static analysis result for SHA-256 43267a51c07f9973…

MALICIOUS

PDF

109.5 KB Created: 2021-01-20 12:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 75f8dec2c7ff0da6ee165134fc4e816f SHA-1: 13c5cabc54d11fe7a97a864a6d4b0557e93274f4 SHA-256: 43267a51c07f99731d4a7878e8e43ba6532ab5af888b20b671d454fd22ade9d2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a significant number of external links, suggesting it functions as a link farm designed to redirect users to other sites. The presence of a URL with a 'utm_term' parameter further supports the idea of a phishing or redirection campaign.

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://druttle.ru/123?utm_term=nest+learning+thermostat+manual PDF link annotation
    • https://site-1226658.mozfiles.com/files/1226658/covered_california_income_guidelines_2019.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/dufib.pdfIn PDF document text
    • https://site-1168118.mozfiles.com/files/1168118/espn_mlb_standings_predictions.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/2956995.pdfIn PDF document text
    • https://site-1243240.mozfiles.com/files/1243240/keppel_dc_reit_annual_report_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/ghjjunX/monolisk_rpg_ccg_dungeon_makers.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/dhieije/97278561593.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/2692883.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jjfPhgG/68834113783.pdfIn PDF document text
    • https://site-1176887.mozfiles.com/files/1176887/ww2_polygon_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/nzhhNje/virtual_families_2_extremely_weak.pdfIn PDF document text
    • https://site-1172486.mozfiles.com/files/1172486/trig_identities_puzzle_worksheet_answers.pdfIn PDF document text
    • https://site-1228102.mozfiles.com/files/1228102/fishing_guide_ffxiv_70-_80.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/YPqETzH/66962231529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimadetuvawese.rf.gd/72942416893.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/manager_meeting_notes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bbc_iplayer_video_capture.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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 45312 bytes
SHA-256: 98ae1ae195c8235c4a834f0e75c7242a626033a9a210dbcee48e69daf10ba680
font_01_sfnt_off00017010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17010 5068 bytes
SHA-256: c80e83bf124ffa1b701faf19496b0dae1c8970da9bd9e199815a2040e174ad84
font_02_sfnt_off00018124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18124 13084 bytes
SHA-256: ad49910a853e7488bed28881a1b248093ef9e62ebba8c29b79a4642c52f0fa3b

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