Malicious PDF — malware analysis report

Static analysis result for SHA-256 0134dbf4a7cf2f16…

MALICIOUS

PDF

67.6 KB Created: 2021-02-26 00:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ce9d07883d77b1c65093ad5a0375066 SHA-1: df505e817989b627e40107aebf86771fb5276497 SHA-256: 0134dbf4a7cf2f1601610d49b974d6c5422531fc2e9e558c8355045fa170431a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=samsung+rs265tdrs+specs PDF link annotation
    • http://nulonelam.66ghz.com/88172518511.pdfIn PDF document text
    • http://jubemexor.22web.org/tubemate_latest_version_for_android_2018.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/ruvewuti.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/ragefij.pdfIn PDF document text
    • http://guxetiz.22web.org/omnitech_shredder_red_light.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/5xay0jh/juxabemer.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/2jgtwe6/92752655300.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hehgfhb/27330662392.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/jbighib/mujodidonibisasoxifovabe.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/VhfOv46/mukovuwetimefes.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/lupusuzegurita.pdfIn PDF document text
    • http://fiwojinafo.22web.org/90732354891.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/3cAbn8n/lego_racers_2_rocket_racer_car.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gH1QF0c/maps._me_offline_maps_travel_guides_navigation.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/ggX7ggx/96882163712.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/fezodipod-luzubilapuvize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejivexol.epizy.com/makogimumalaneposelore.pdfIn PDF document text
    • http://pebitezilewabe.rf.gd/warhammer_40k_8th_ed_rules.pdfIn PDF document text
    • http://rorizupoduvu.epizy.com/39497638377.pdfIn PDF document text
    • http://tugojolowok.epizy.com/artist_painting_video.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_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 5872 bytes
SHA-256: 54a62baac5d2a27792fd02f3a6b029bbe84caea3dcde6a82ba8cb665fc065119
font_01_sfnt_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10788 bytes
SHA-256: 7710e2aae531b59ce1c2fc96740bbf82d16bcac02d079ae0cb8edc6845fc2aad

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