Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c10edf2906ec67…

MALICIOUS

PDF

71.6 KB Created: 2021-03-02 08:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0ff1fdb8cbe864ed207c0a62ff588ed2 SHA-1: 243efe8a6f279f81412d5e76267a1d50049b3838 SHA-256: 63c10edf2906ec6753b3f70d871f7597b2c0b4ce545c0dba6b5bc277a2a7ac58
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of 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.
  • 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/wix?keyword=glass+ellen+hopkins+free+pdf PDF link annotation
    • http://wokizunapajunez.iblogger.org/nesavasiwukegew.pdfIn PDF document text
    • http://nomanodix.iblogger.org/modobakajenoze.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/cKjPE5w/pupaxomeviwuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fde614a1e6e4.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/dgfibid/37637297695.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/regafijedodifevu.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jhhdRXp/download_game_the_heroes_of_three_kingdoms.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/5jkqVwL/75698427086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fed45d0bfe62.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/d8iL3gc/minecraft_update_1._17_snapshot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe383a83bbf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valaweno.rf.gd/tixonazaresax.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/anbe_sivam_full_movie_hd_1080p.pdfIn PDF document text
    • http://sukowinom.rf.gd/93252510871.pdfIn PDF document text
    • http://gazemaj.epizy.com/duzelekutajovabitow.pdfIn PDF document text
    • http://zilekej.epizy.com/audacity_chorus_effect.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/smadav_antivirus_2016_for_pc.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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 5224 bytes
SHA-256: 3aac6860cb78242ba3fe0b56154fd0c7b9319f7eac538a2bb1ac742b4fdb93d2
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10384 bytes
SHA-256: 361a0bb5e255932e097eb7a9afeb15ef86bfbae97d5558ecd47a74d280d8b1e3

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