Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb50509d69857a…

MALICIOUS

PDF

96.4 KB Created: 2021-02-20 05:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: acff03d4cc5db1b89c997d12828c81ee SHA-1: 231ed98cd10faa5e136b13221d3436a78dfacc15 SHA-256: 4feb50509d69857a7e56175ca9f904f90045eccbcaa3e1f2c192470ca0f09be4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://crophysi.ru/123?utm_term=dream+moods+dictionary+apple PDF link annotation
    • http://lnstagaram-verifiedbadges-from.com/286778096894sch4.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/zokawunamo_vodemuwufimita_zulij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_601d30f66e13b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fdfb7b73bf67.pdfIn PDF document text
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/cbe863c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6015c2ac3cad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601a3a4505749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_602343140863d.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/petik_xopujopunov_kenekewiwi.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/1288459.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/da3dbae026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webidiwotew.epizy.com/reasonable_suspicion_policy_template.pdfIn PDF document text
    • http://metusajixano.epizy.com/ak_47_gun_firing_sound_ringtone.pdfIn PDF document text
    • http://wefazor.epizy.com/parked_car_accident_report.pdfIn PDF document text
    • http://jikusawiv.rf.gd/rainbow_vacuum_se_price_2019_singapore.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_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 5320 bytes
SHA-256: 672e9874ab1aab5a826aa4c843e1671d375ae3a183ebbe9e5b1503dae052ee7d
font_01_sfnt_off00014db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB0 11696 bytes
SHA-256: 9777f8b96f9992b6891a618d3b2ca24fcda9004cb95544f6f2f95427e12b0432

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