Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7b6711e08dd00d…

MALICIOUS

PDF

68.3 KB Created: 2020-11-13 08:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23867cf4f4a19a131185c527f4a65fd2 SHA-1: 1845b5870232cc0bedbecb142b8af0f66c39695b SHA-256: aa7b6711e08dd00d42d974d33793e2291c70485ba653705d75633c736946cced
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and Amazon S3 domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=ccsuweb+date+sheet+2019+back+paper
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/15cd293.pdf
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/7547750.pdf
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/d1ae3b80516e.pdf
    • https://gigewobejej.weebly.com/uploads/1/3/4/6/134638222/1142097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujodibu/legit_free_bitcoin_mining_sites.pdf
    • https://s3.amazonaws.com/petikamov/94304329931.pdf
    • https://s3.amazonaws.com/felasorarabipis/age_of_empires_definitive_edition_cheats.pdf
    • https://s3.amazonaws.com/doxifuba/pepafafanovasikilog.pdf
    • https://s3.amazonaws.com/zosevid/stats_modeling_the_world_2nd_edition_answer_key.pdf
    • https://s3.amazonaws.com/vososasoxumete/basketball_court_diagrams.pdf
    • https://s3.amazonaws.com/zomuzigo/booking_disney_trip_2020.pdf
    • https://s3.amazonaws.com/kavitokolezub/present_cabinet_minister_of_india.pdf
    • https://s3.amazonaws.com/mejifavo/carta_de_perdon_a_mi_hija.pdf
    • https://s3.amazonaws.com/zuses/49652832976.pdf
    • https://s3.amazonaws.com/gupuso/pajefizugexiretuzebapin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc85.bin
58fbb200d33816300ae091497211b9b026f6bcc1bcdcc8378d230b8cd4d64fed
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 5812 bytes
font_01_sfnt_off0000e051.bin
e62f0f56624064e645355d5625fe7dab85651a1d501d5f33f8e1deada9745fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10492 bytes