Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aa3600964663b7…

MALICIOUS

PDF

93.7 KB Created: 2021-02-13 19:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eb23d33a220c630b745443595b84526 SHA-1: e0a8d9e4091fb4b58f8cec689784f4ec9047d44b SHA-256: f3aa3600964663b70ea894fbace74d8c4c45826fd8cbba095898c2ef5f80a938
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files hosted on various domains and Weebly/sqhk.co subdomains. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://seumenha.ru/wix?keyword=riruka+bleach+brave+souls
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/wenedexoziru-ketoxe-wowigukotineno-tomak.pdf
    • http://dragonflysagewellness.com/colossal_imdb_parents_guidew9vxn.pdf
    • https://cdn.sqhk.co/faresawuf/bmjbMa3/56974612341.pdf
    • https://cdn.sqhk.co/xopuwomu/hjRTjjv/savimelavujikogi.pdf
    • https://cdn.sqhk.co/riwaxagi/Iwghge4/71447570310.pdf
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/42ab49.pdf
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/5142156.pdf
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/9001309.pdf
    • http://pubgucbayim.com/dolafaparumakoravapajipwj7.pdf
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/9146173.pdf
    • https://cdn.sqhk.co/dodazija/e0hjibQ/super_gaiden_pc_engine_rom2.pdf
    • https://cdn.sqhk.co/sifajoxojif/kChhggd/bakidinezegifa.pdf
    • https://bawimivumo.weebly.com/uploads/1/3/4/6/134609907/turapik.pdf
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/e6b7f622.pdf
    • http://reggis.info/37945016528hvx1p.pdf
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/9a2aa21d09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011291.bin
5eaba2a361fac939f3ebf1b8342f74aca824966c1971db02e52db1485633f907
pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 10092 bytes
font_01_sfnt_off000133c2.bin
8a827970414991f97954cfc6aca9acf583014693fc9454f83428ed461029d999
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 5156 bytes
font_02_sfnt_off0001454c.bin
34a2a821309db940f1b3ff9c44759f12cc2f3905b35299d0267b227970793600
pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 10436 bytes