Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28ee5c2effcd057…

MALICIOUS

PDF

76.9 KB Created: 2021-02-16 07:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb57866cdf66bf364a8463472bf7d62 SHA-1: d8fe332ada27b4570b7aefebf3352a3c16993e52 SHA-256: e28ee5c2effcd0574edc47a66b216545af58c09536d083a410cd7b57d6554725
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious content distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/wix?keyword=significado+de+la+doctrina+de+los+nicolaitas
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/duzozidex_betujetelasi_sowirebigefit_jipix.pdf
    • https://static.s123-cdn-static.com/uploads/4420237/normal_60049f8b91b4d.pdf
    • https://minawitagolufu.weebly.com/uploads/1/3/5/3/135312922/3894921.pdf
    • http://kubarabonexomi.iblogger.org/united_airlines_gate_information_sfo.pdf
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/tejikexaperosed.pdf
    • http://rowaxuxot.22web.org/malaria_treatment_guidelines_cdc.pdf
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/xulajomodonakina.pdf
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/rafufefisazigubawen.pdf
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/30885c0ab05.pdf
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/bunolalopimirud.pdf
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/logoraporefapaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bowedujo.rf.gd/l_agriculture_biologique_au_maroc.pdf
    • https://s3.amazonaws.com/wiwamoxamo/anari_old_movie_songs_free.pdf
    • https://s3.amazonaws.com/dusubonifu/challenge_bhojpuri_video_song.pdf
    • http://zumoriko.epizy.com/fexijaredelejiramokewabub.pdf
    • http://puzexexaniledow.epizy.com/diloluso.pdf
    • http://wisigisovet.rf.gd/58816757148.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_off0000e895.bin
02daa6729c184d3eb356ac9593be30cd63d604f07939efbb88fcf301ca64ae9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5292 bytes
font_01_sfnt_off0000faaa.bin
2dcd4a7698df247ba307967ab8a82603934fcfc6c4f1b3f1659d813ef64ed39a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 13228 bytes