Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54c4a4075067e0e…

MALICIOUS

PDF

90.4 KB Created: 2021-04-23 17:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a14ae1c93cb3454fa9beeee604143bb SHA-1: d7c7808abbc8082ec84f85c297c20049c1fc6c68 SHA-256: f54c4a4075067e0e0fb7f82a68a07aefa2aa8cc49a565b74e0502874dfb94ce4
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://ponafet.ru/strik?utm_term=batman+the+killing+joke+batgirl+ending', appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/strik?utm_term=batman+the+killing+joke+batgirl+ending
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/jexemozele.pdf
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/xexuwedapidaxa.pdf
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/3803470.pdf
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/663591.pdf
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/xadunesozawoku_kavisex.pdf
    • http://sotaredojowiba.iblogger.org/52649805786.pdf
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/falapepevaje.pdf
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/sonomazakibizodusu.pdf
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/reluvoxodudiveg_fuwubezerepu_rofemoted_punefedarokumed.pdf
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/nalasizaponu_veret.pdf
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/gutumemonepuv_vulobolukibep_jilubokedafir_paribe.pdf
    • http://guketepudepi.iblogger.org/breakthrough_plus_2_teacher_s_book.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/xugagatuwawu.pdf
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/gopapevesup_dovuzulubakiw.pdf
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/1712631.pdf
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/kuxamogunijaroj.pdf
    • http://tobolekes.iblogger.org/kenabimafanekeparugenisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tekunobujolid.epizy.com/ofac_countries_list_2017.pdf
    • http://reloroxegexe.epizy.com/dazefalelimixumanefa.pdf
    • https://uploads.strikinglycdn.com/files/c772c010-bf60-4512-aea5-483aa056f698/how_much_do_detectives_get_paid_a_week.pdf
    • http://wezobizezet.rf.gd/riachuelo_definicion.pdf
    • http://faloboxodutak.epizy.com/f_a_x_ka_full_form.pdf
    • http://dorufuta.epizy.com/sajaxosura.pdf
    • http://pewozemiludex.rf.gd/12928510607.pdf
    • https://uploads.strikinglycdn.com/files/48b0488b-4016-4f1e-9e25-9d2c7954f970/harman_p68_pellet_stove_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011716.bin
05a8af3254e2d09a6ce61dda014c2ff3d96661fed4de3a1910cae93d57c64790
pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 5180 bytes
font_01_sfnt_off00012876.bin
5a901ac75188c7b1757a18c90316446af2cbca6951d317d26770d4503d46115f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 11032 bytes
font_02_sfnt_off00014ddb.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 4324 bytes