Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a953da9cae0edc…

MALICIOUS

PDF

67.8 KB Created: 2021-03-10 14:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b649c1c442fc65707c6b82c85b78ce43 SHA-1: 7c8c2ef28595b8ba5faedcee444c6f8914ba8deb SHA-256: 45a953da9cae0edc8c0aeacb3bb258732aff56a0c1070a2131bf414d6ccaf7b8
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 malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a watering hole or phishing 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://jacksth.ru/award?keyword=corong+buchner+pdf
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/1229541.pdf
    • http://reduslim-ordina.site/holter_ecg_monitorbtaw6.pdf
    • http://fulusixavopowem.iblogger.org/causas_de_aneurisma_cerebral.pdf
    • http://harmony-market.ru/16187536181wrr3v.pdf
    • http://clebohets.xyz/larson_calculus_textbook_answersd5jtd.pdf
    • http://koprovk.xyz/korean_alphabet_keyboard_stickersuvc4t.pdf
    • http://amandeepsadyora.com/nuremaxukerufem6sdb.pdf
    • https://regapopuro.weebly.com/uploads/1/3/5/9/135964604/5bb2132cd.pdf
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/2879367.pdf
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/9147492.pdf
    • http://am-sound.ru/nopunavijulisugovosojeox88x.pdf
    • http://vobigabifinu.22web.org/automate_the_boring_stuff_udemy.pdf
    • http://fdvsefwfrw.space/colliers_minneapolis_industrial_reportwvw3k.pdf
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/luxuvef-tibegaruja.pdf
    • http://wow50.pro/is_honeywell_compatible_with_nestd6pbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dupula/ririwetivi.pdf
    • https://s3.amazonaws.com/susonanezaj/7017866089.pdf
    • https://s3.amazonaws.com/jumedemimo/90179123307.pdf
    • https://s3.amazonaws.com/jiwisi/arduino_esp8266_projects.pdf
    • https://s3.amazonaws.com/wizomoravazub/bingo_colours_printable_worksheets.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_off0000cf4a.bin
15098c7a395bfe03692349369c85759f5e64c7604a8f929dc3993198f6f5618d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 5040 bytes
font_01_sfnt_off0000e069.bin
18410637aa80d444aa067de6c9158baee812162a4fccddc3cc96ed91d2f393cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 9852 bytes