Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c2ff90fcf3c0d…

MALICIOUS

PDF

78.5 KB Created: 2021-04-01 20:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4acaf296e992e8cdd9461c01fab7c362 SHA-1: d390fc9f68911651b6ed6d780ef0b5000f3c6a47 SHA-256: 4d8c2ff90fcf3c0d6d743484ba6a42e811deb255d94d8eef6aee0d2f2e998a3f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a 'service manual'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=victory+gunner+service+manual+pdf PDF link annotation
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/5612600.pdfIn PDF document text
    • http://gladkoe-telo.xyz/interior_designer_salary_dallas_txc8tiu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fd2cf809c168.pdfIn PDF document text
    • http://familyit.pro/magnum_ms4024pae_inverter_manualzzxxk.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/4eed4f3.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/pusevirivanupam-sizukidine-sunixobitobo.pdfIn PDF document text
    • http://metalllift.ru/sidukizuzevugo9lsjp.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/feba072dfadf.pdfIn PDF document text
    • http://bottlechainworld.com/can_be_used_to_communicate_with_satellites_brainly3o5hd.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/5fbc9aa55e.pdfIn PDF document text
    • http://deluwotitawugo.iblogger.org/2020_toyota_camry_hybrid_le_seat_covers.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/b2861525cc08b5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_60046ebdce4c2.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://pufosibixoge.rf.gd/88832717114.pdfIn PDF document text
    • http://wevevaviz.epizy.com/tisosizet.pdfIn PDF document text
    • http://zivositad.rf.gd/rojeloteveji.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_f90b48ee1b8c446c95b3ba4c04bd09cf.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_e4f29ef352c14762a847f60fac854aaa.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_89c4cf15649d478c81c895567d29ea85.pdf?index=trueIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_696f28f288184e5d8f7c185fe317a5be.pdf?index=trueIn PDF document text
    • http://bozudob.epizy.com/sublime_text_json_formatter_mac.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5484 bytes
SHA-256: 9ff5328c6cef18e647211219f1ec8bc0f3996a81d404377d0352299d992b947d
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 11600 bytes
SHA-256: 2905143c5a5546f44715133c5a1762bc5e9e3aaf285bf2e8cff0855791e9fb67
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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