Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad79a8e85ffbb10…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 04:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e5d75dc46cd8f5c7420ebaafc546a53 SHA-1: a7fe9df17d71cce44234445cea47ab7e9938db63 SHA-256: 1ad79a8e85ffbb1023514fd337d65e01c4453aef9b08f5a4b6c856c1f2325982
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('botokaw.ru' and 'bilapak.66ghz.com'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, a common tactic for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=bed+and+bath+extra+long+twin+sheets PDF link annotation
    • http://bilapak.66ghz.com/44442640603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_6056d0bf810c0.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/8627986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fdec8d1c4432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_60082931d5a97.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/malur.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/jozinawuxifapo-viwituvitorub-tekovoke-fetuveje.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/d80f0.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/sewapixofopaguv-radujo-gadofogan.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/dasurozoxomisam.pdfIn PDF document text
    • https://wofibenozoga.weebly.com/uploads/1/3/5/3/135321696/2147862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fe6ce421fdec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/litunux/is_panda_express_safe_to_eat_while_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/pilujiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6a53f0-8a69-4b80-b3d8-00aafbed6737/duralast_900_amp_jump_starter_charger.pdfIn PDF document text
    • http://kubagaxupusu.epizy.com/ampli_vox_ac15cc1x.pdfIn PDF document text
    • http://nudobovedazopor.epizy.com/quality_and_reliability_engineering_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/88721895045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e015d4-a13c-46e3-aee0-518523766e48/troy_bilt_tb130_xp_parts_diagram.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 5436 bytes
SHA-256: 94d6ce66ad97057f9abeeb13265f4289d1e2dde76bb606788c185f3013e3df43
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11052 bytes
SHA-256: 7c6ae1ac7818b08a584c98c137b002c1ff3316c70820d0370caa6b8599f46260

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