Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4361111817e73a…

MALICIOUS

PDF

82.5 KB Created: 2021-02-09 17:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e2c9705026c9a77567023ee277f83dde SHA-1: 758827719746dedeee4f381440940385939b147f SHA-256: ca4361111817e73a71ede1c9d41876af2c0270a61f1569554b86992d22af8cd3
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 hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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/123?utm_term=kailua+intermediate+school+campus+map PDF link annotation
    • http://torchland.xyz/668942298515d5iq.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/hgdhftb/kiwisexaji.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/jjfQzDZ/snow_moto_racing_2019_freedom_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xupasutejos/fmIibRt/degefuzasapama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365636/normal_60021bb345126.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/jeaiagj/skyblock_maps_for_minecraft_bedrock.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/6471910.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/vufebilew.pdfIn PDF document text
    • http://zedukibawubige.22web.org/nejimedanore.pdfIn PDF document text
    • http://ketrovk.xyz/wevijwhuva.pdfIn PDF document text
    • http://pek-24.cc/set_switch_stack_priority_36509s81o.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/b3fc9d.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/hjOtXhd/mubilogekojojorujagu.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/OXj5gfN/passcode_off_lock_screen_ipad.pdfIn PDF document text
    • http://artyom.guru/absorption_line_spectrum_astronomy_definitionusdhr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilevatawew.epizy.com/xatiratujudamulamamugorom.pdfIn PDF document text
    • http://gajovab.epizy.com/13062007521.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 5280 bytes
SHA-256: dea29969c6dadaa7ae72b12162a427e07629488e11440309279d0017fd7f0e95
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 12184 bytes
SHA-256: f4a4dadb456690d82d3431fbc2351a85195c676c958ed772cf1e60a76cc29de6

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