Malicious PDF — malware analysis report

Static analysis result for SHA-256 a781c37677b87f7d…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 21:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ba0bc50e04750af0538a902b65371a9 SHA-1: 456836afb8146136a82ebe9909d6c1482c62e4a6 SHA-256: a781c37677b87f7d842e0002b38e5644b07ffefbe2eab06f2e537dd190837a6e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=can+you+reinvent+yourself+at+50 PDF link annotation
    • http://dnepr24.info/815263600386uix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fc8474d297a2.pdfIn PDF document text
    • http://strongcreditscore.info/how_to_modernize_an_old_mobile_homehfzng.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/somovemupuwi.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/92e4cca8cf9.pdfIn PDF document text
    • http://rabota-plus.club/milotaxijasewepodijnnzh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_6004850911a13.pdfIn PDF document text
    • http://niwawopomovaz.22web.org/film_atlantis_milo_s_return.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_600fe74ee2d4c.pdfIn PDF document text
    • http://surevixa.22web.org/vifimudaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furosusuz.epizy.com/how_to_put_on_gentle_leader_head_collar.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/2014_chevy_impala_limited_manual.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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5096 bytes
SHA-256: db550324f3af19a9681a164823a03ce0f3a1c55380556bbb12ec5bdc5a1c1f53
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10656 bytes
SHA-256: b784d6211fc4367222f23579fd35fa79333f78abce4f8fa8c51421f4393ed347

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