Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b00033d55afe56…

MALICIOUS

PDF

79.3 KB Created: 2021-03-04 05:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4412b77b83a6e7787e21d8ddddaaf9ae SHA-1: 3cf0b60fd4be8ddfe46996fed3022e0703509ae2 SHA-256: b4b00033d55afe56c777cf7eb36506ec4a2516694835bb356ebf64a578ed6de1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. ClamAV detection and ML classification indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=stages+of+divorce+for+the+initiator PDF link annotation
    • http://potaberukogox.66ghz.com/new_apft_run_standards.pdfIn PDF document text
    • http://mozuganimaf.66ghz.com/vopakuvexejuzipeju.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/20251224751.pdfIn PDF document text
    • http://puforirobitu.iblogger.org/how_to_send_my_location_from_google_maps.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/costco_vitamix_black_friday_2019.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/stay_with_me_piano_sheet.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zuwurazoku.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/xejaxabuwoxuvikiw.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/1978919980.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/mothers_day_special_inspirational_quotes_in_marathi.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/what_is_tqm_and_why_is_it_important.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/78626858278.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://wokepotaku.epizy.com/adobe_photoshop_tips_for_beginners.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/pinaj.pdfIn PDF document text
    • http://funuduki.rf.gd/bootstrap_website_templates_free_for_education.pdfIn PDF document text
    • http://rolaxaja.rf.gd/avon_september_2018_catalogue.pdfIn PDF document text
    • http://matufuw.rf.gd/45993068408.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/gekuwuzofiruz.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5200 bytes
SHA-256: 78eae36e3ed8ffcef2fe173c04cc229e2412953228bea2fff032e5bb22d2b509
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10428 bytes
SHA-256: b9780096afae206f5fe40578ceb08ddb3b8cbb794d7727a640f9cbb97c23e8d2
font_02_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f