Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcfa666b0a1bc31…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 04:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 692fde19eb92c8b19462f61a9e8e8481 SHA-1: 6b704a74581efcc83f2bb46556f8fd604dd11c6e SHA-256: afcfa666b0a1bc31daf08bc4defe2267b5aaf1afaa0efb02c4a9b38e3102ffb6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://trafficel.ru/123?utm_term=a+piece+of+cake+pdf+roald+dahl PDF link annotation
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/gokodexifepubikixok.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/vovijilejarujel.pdfIn PDF document text
    • https://site-1180330.mozfiles.com/files/1180330/christian_songs_about_prayer_and_fasting.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/2668341.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/9145503.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/hdGibge/12538707332.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/8jijfgi/vobeberimogurozasitow.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/gdsjisC/are_basketball_shoes_non_slip.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/wefiruvumedul.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/9NZFhcd/90_s_hits_album_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/jbhaghG/narizojabijeso.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/niporofez/bavigovenulebevefukivezur.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/adblock_android_10.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d8c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD8C5 13432 bytes
SHA-256: 7d39fad0ec26e8310bcef7d77eb8f385400d31530c2dde2e64a1f7f620a6e5b1
font_00_sfnt_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 5116 bytes
SHA-256: f950897923e3bdd4fd77c2c072a2a7800ed04cb2664f874f624e349335f74c76
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11040 bytes
SHA-256: 0b42b78d6d199b7087f17cb5e1ff5e7dbcf23be56e9b0fba32b7b14834020214

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