Malicious PDF — malware analysis report

Static analysis result for SHA-256 748c0f7f2edafedd…

MALICIOUS

PDF

84.0 KB Created: 2021-03-17 10:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c975713ff34e8935f725c920cea2f323 SHA-1: cb5ad916a51496b5fd1998853cb79e7c04474382 SHA-256: 748c0f7f2edafedd10276d96b3b824e0912e8b175db3b61e2839722b1f614e2f
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-focused, indicating a potential link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://leonvi.ru/123?utm_term=gmod++addons+from+server PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459791/normal_5fdc7ac7a27b3.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/8105006.pdfIn PDF document text
    • http://yognat.space/anand_movie_video_songs6dmh0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445334/normal_5fdd6afd639ca.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/dacb26d9c682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5fd68e2de97b6.pdfIn PDF document text
    • http://circulshtangcalip.website/12617355732v5ura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fca962c3f3eb.pdfIn PDF document text
    • http://joruzutababu.22web.org/77097854981.pdfIn PDF document text
    • http://virnet77.ru/monster_truck_hill_climb_drive_offroad_gamesel5k4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5ff3eb47193b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5ff03fc20bf12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5ff708b56926e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafiwokewe.epizy.com/papujusigivuxepi.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/fuzatib.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/adobe_after_effects_basic_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/turn_off_caller_id_android_7.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/batman_1989_full_movie_tamil.pdfIn PDF document text
    • http://xogowakowokavuw.rf.gd/lefovepupujanaso.pdfIn PDF document text
    • http://rotaduwifomol.rf.gd/fonupugebewixizakaxil.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/59051063696.pdfIn PDF document text
    • http://vagafalim.rf.gd/pafavuxelapudebuxixamozuf.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_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 5112 bytes
SHA-256: 879e08b0942734b950b37460a88671c2a0666d33f1943313ad356f18bc6db0c2
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 13172 bytes
SHA-256: 56f2230022d70824a5059b6df42d7098460514d3d996d9d47b7475616879f971

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