Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eee4fc2fa0c3959…

MALICIOUS

PDF

91.5 KB Created: 2021-02-20 15:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7aef6a76c7a65c802d970577a6de63b9 SHA-1: 777ba02e1b8ed226d8e3722f636f879d2986a674 SHA-256: 2eee4fc2fa0c395953a988228c3b426c264c94633bfba264c8d1149f7bbbb1c7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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
  • 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/123?utm_term=roku+3+remote+volume+not+working PDF link annotation
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/tavile-dujegufegudu-velexevosaxevok.pdfIn PDF document text
    • http://vifowidatan.22web.org/bcbstx_member_appeal_form.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/9058362.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/a5givdI/liquid_oxygen_element_or_compound.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/fDYhcgj/talimokovegesupiti.pdfIn PDF document text
    • http://vbruti.site/guporozejezugivotumifkpsl1.pdfIn PDF document text
    • http://bilkan.fun/sunesotlzs4v.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/xulek.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/9382348.pdfIn PDF document text
    • https://cdn.sqhk.co/walekikem/dHuhcjj/79271169154.pdfIn PDF document text
    • http://vavawosasote.iblogger.org/25960378557.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/tolow-woxijuna-juzojebebuxij.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/a51d9c8.pdfIn PDF document text
    • http://canlisohbetim.net/apsara_assamese_movie_video_song0j8eo.pdfIn PDF document text
    • http://bowemesuzot.iblogger.org/ubuntu_18._04._1_lts_bionic_beaver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulaxojanomu.rf.gd/agya_koo_nimo_songs.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/26303067077.pdfIn PDF document text
    • http://narivisifan.rf.gd/50008720183.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_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 5004 bytes
SHA-256: 95b6e1acc121fd236472a7d0af0846034e3587e8320d75560f0c3db41a50dc8f
font_01_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 11544 bytes
SHA-256: 105217f59b5576adb9e54ac8383e4e58275c1cc648ff47537af5f2f4d4634a3f

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