Malicious PDF — malware analysis report

Static analysis result for SHA-256 234a48cf5801cc60…

MALICIOUS

PDF

88.3 KB Created: 2021-06-11 02:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a3ad35bdb02d62b40686c2a90ca02b1e SHA-1: aabfe940878115d1a7f9d323ffe3b4e4e9780b57 SHA-256: 234a48cf5801cc603f99611b1b3b57a45b357d6b6760ee4cde7c08e6997e9d5a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a notable one pointing to 'crophysi.ru', suggesting a lure to a malicious site. The PDF structure and embedded links are consistent with phishing campaigns that rely on users clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://crophysi.ru/123?utm_term=spotify+music+converter++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60523f1da7ebb.pdfIn PDF document text
    • https://xaviwemegegel.weebly.com/uploads/1/3/4/8/134859007/3273761.pdfIn PDF document text
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/10316fbc3.pdfIn PDF document text
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/d6e28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_6013393adcb09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60373138df22f.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/xixemuwozalofaboni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/357e1b42-8b34-45b3-9504-6a1d4d629534/astro_a20_xbox_one_wireless.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144441765/51945902788.pdfIn PDF document text
    • http://povivokovawi.pbworks.com/f/draw_a_stickman_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3963276e-8fc7-40e8-aa22-3fb8d0c755ab/warrior_vs_omad.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144508137/how_to_add_bleed_and_crop_marks_in.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144608697/82935333893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172369fd-710c-4925-9f70-07b2334b3f8f/ejercicios_de_distribucion_binomial_resueltos.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144532083/50318752187.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/94810409524.pdfIn PDF document text
    • http://nimulivupale.pbworks.com/f/what_does_code_826_mean_on_irs_transcript.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144441264/59567474212.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412611/guzopuvosonudojukum.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/21146792004.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/30482822107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afb3acf-3787-4827-a4d8-17b1be26a064/where_to_download_light_novels_reddit.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_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 5184 bytes
SHA-256: d24ffafa860e5d26b4c9d17c1fb65dbf0e15f3dcc1d0c8abe68a11942bd1b1b5
font_01_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 11724 bytes
SHA-256: 61ce54485d0edd07f3819b3893bcc0b5a7c9cd7d83c3d8812436767a2809fbfc