Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1614759595878c6…

MALICIOUS

PDF

69.3 KB Created: 2021-03-19 06:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e5d8a1180ee284d245b750c6c886ff SHA-1: 95d2c83291616989065f45a3c54d46b9dbd3dfbb SHA-256: a1614759595878c6594df64cc2eec9dbd0889c21ca78491d4c411dc54ed60cb2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with one URL specifically mentioning 'ama manual of style 9th edition pdf'. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious websites.

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://dafemum.ru/wix?keyword=ama+manual+of+style+9th+edition+pdf
    • https://wisemawuperu.weebly.com/uploads/1/3/0/7/130738751/b0e5160b7.pdf
    • https://burobedulaku.weebly.com/uploads/1/3/5/2/135299914/dibaba-kenewukenilixap-gobopufulisix-vabevemowane.pdf
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/jedazu_vidotex_fipeniregonefon_denuvakomufavif.pdf
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/kositirojavales.pdf
    • http://fanitukasi.22web.org/17209829959.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/e53af1a76c1.pdf
    • http://kulokozataxat.22web.org/augsburger_puppenkiste_lieder.pdf
    • https://cdn.sqhk.co/ruzaxube/Hiix6jf/jugagunejuzaniketakil.pdf
    • https://sopudediliwaweg.weebly.com/uploads/1/3/4/5/134587721/5656582.pdf
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/8082297.pdf
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/rofixosijilugip.pdf
    • https://cdn.sqhk.co/bitomasijelo/idhiEja/21884720278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixisariwulo/76908013862.pdf
    • https://s3.amazonaws.com/luborinizu/86134993125.pdf
    • https://s3.amazonaws.com/tosego/jelobawefogixixufo.pdf
    • https://s3.amazonaws.com/sagotomagin/98301999954.pdf
    • https://s3.amazonaws.com/padosumifubobo/22722725860.pdf
    • http://takikixak.rf.gd/8454923713.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_off0000d18f.bin
d68e7d5ec6a2494fb184d05d03d1b694446286e57039f593d1cd2c629feb148f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 5432 bytes
font_01_sfnt_off0000e3ea.bin
e75424022caea6e7ad99111dafe911441cbd70e9a71cda13a52376410592a876
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10584 bytes