Malicious PDF — malware analysis report

Static analysis result for SHA-256 6762c2b838527ca3…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 17:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 20d21271019b95fee3b05d8444ce44a0 SHA-1: 99bf69eb614ff8f143d426e8c5619c8bb6229fb5 SHA-256: 6762c2b838527ca383819621e24af40d24fc8e7b6613991c777e4f0df8983cda
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to a known malicious domain and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to external sites, likely for phishing or to download further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a deceptive intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=catholic+baptism+ceremony+pdf In PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/bolibagelob.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/eixPgj4/spiral_christmas_tree_led.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/Tgihceh/super_snake_mustang_1967.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/a1aff772724349.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/AjhoiKm/94054243987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_eaea103464aa40f6a3ce19dc1f7768b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/what_size_tires_are_on_a_2013_dodge_avenger.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/active_and_passive_verbs_worksheet.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_5c6166a428bc4cfb907d7fe2b69d9414.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_45eeb517ff23472d9b760d017e893cb1.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_86c0175da4a8460487fca174a99c4381.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_fd3db10ed7cb49b8ae1c4f2d6c28a154.pdf?index=trueIn PDF document text
    • http://bunaziwafifa.epizy.com/blue_landscape_wallpaper.pdfIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_4886b8d772c1460891e9985f82043508.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/data_structure_and_algorithmic_thinking_with_python_book_by_narasimha_karumanchi.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/50211872721.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_8ab243a946454911acba93a630d96d18.pdf?index=trueIn PDF document text
    • http://tokaluwog.rf.gd/adobe_illustrator_bangla_book.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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 5540 bytes
SHA-256: 2b48cf32af029143f1be3512d321016622a3c04095138300b964f717722a8710
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10728 bytes
SHA-256: 44bf59a762e3537d56665e000a820e4f8868102117b5eb134283c54a73abc976