Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cc65fbc4e8482e…

MALICIOUS

PDF

87.0 KB Created: 2021-01-16 14:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad3439b9d56a3bd6e2782f7441f9f438 SHA-1: 7e9b8169a81ccb7ec3469c52d31edbdab55f28e7 SHA-256: 27cc65fbc4e8482e9cf4946648a0127313935addccb565e70fdd3993385f03e6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

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://traffset.ru/123?utm_term=insufficient+service+of+process+texas PDF link annotation
    • https://site-1174866.mozfiles.com/files/1174866/bouncy_ball_online.pdfIn PDF document text
    • https://site-1231318.mozfiles.com/files/1231318/fallout_76_hack_50_terminals_trophy.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/ririfarixuk-kepumikedovaz-vonijupebaf.pdfIn PDF document text
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/a5aeb93fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/gfuibie/tivifigoker.pdfIn PDF document text
    • https://site-1173403.mozfiles.com/files/1173403/90454633163.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/26753406330.pdfIn PDF document text
    • https://site-1178425.mozfiles.com/files/1178425/56608324583.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/BhgghfW/oxygen_concentrator_amazon_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/lobitukojuro/ihTGicA/download_modern_dead_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/dgiE9hh/westgate_shipwreck_island_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/dinewemilo/XITohxJ/collage_photo_frames_templates_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sufiwotag/Twii6vy/bricks_ball_crusher_level_471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/createspace_front_cover_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/88565448443.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_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 5044 bytes
SHA-256: 910bf1da6f6a5fd69641794a61dc7103dede7ddfd8d7794bb73d67aa89ea060a
font_01_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 11220 bytes
SHA-256: ea00f704536438546f61138ff12c935c8f96b487194450f3d7c8dcb2bc4a8885

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