Malicious PDF — malware analysis report

Static analysis result for SHA-256 4608e0285738bd43…

MALICIOUS

PDF

85.5 KB Created: 2021-05-04 13:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3adc768be92516ce021b148c3062fc75 SHA-1: d593c02d04032507b5c19c44d676c77274bdbcae SHA-256: 4608e0285738bd4375d2adc3e70597cf1b8ed9b9eb3e3e045d296f2f1571389d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=danby+14k+air+conditioner+costco
    • http://geosen.net/bar_menu_template_free_psdpjacm.pdf
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/kowurobadawibaz_sazijixu.pdf
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/8775794.pdf
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/7041777.pdf
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/a42614bb2.pdf
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/4948390.pdf
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/zusumejafetasexix.pdf
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/7415775.pdf
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/2768804.pdf
    • https://wawumojobov.weebly.com/uploads/1/3/5/3/135323155/vepogu_zatatuz_rujufarigu_nedeko.pdf
    • http://converstarget.ru/payaliya_bajni_lado_piya_song_audioqcmbo.pdf
    • http://xojakipizixa.22web.org/ncert_mathematics_class_11.pdf
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/7022656.pdf
    • https://tonulaluxi.weebly.com/uploads/1/3/4/0/134099082/339e7c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0dd236eb-fbfb-431b-a76d-344230f3955f/bigger_leaner_stronger_diet_plan.pdf
    • http://gipozuzuwito.rf.gd/easy_alto_sax_solos.pdf
    • https://uploads.strikinglycdn.com/files/43b544fa-5de0-40eb-ad52-a79f97327c86/argument_from_reason_criticism.pdf
    • https://uploads.strikinglycdn.com/files/71dc4fca-3e8e-440f-8f34-5c5ea02aa3ce/ridixufedekanonofusite.pdf
    • https://uploads.strikinglycdn.com/files/4c1d1afa-2d98-4b1a-b26c-df79710ffa5b/piviritokekuke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fb.bin
93a803c19b180a7a8e82340ad5a240ca678d4e627444ddf018405b3fdf8fe930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 5136 bytes
font_01_sfnt_off00011486.bin
9126bfcd7552c199ffb0d5b211f3e4bda482d0e310bb267b8f84a5410e3776a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 11132 bytes
font_02_sfnt_off00013a95.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 4324 bytes

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