Malicious PDF — malware analysis report

Static analysis result for SHA-256 795486be34ccbbc5…

MALICIOUS

PDF

75.7 KB Created: 2021-04-07 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445bc87d4ff4bd6683a89d884a12850f SHA-1: 7b47e79bb29287af44ee615018980f48f6c546fb SHA-256: 795486be34ccbbc57943d75f47d3b438926194f19c98751d76de8bca9001f6b1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, characteristic of a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=8+ball+pool+coins+and+cash
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/zusosupij.pdf
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/48b3061c.pdf
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/4032165.pdf
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/def181.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_603a0498152ba.pdf
    • http://lufavometazajur.iblogger.org/brother_knitting_machines_for_sale_uk.pdf
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/9132020.pdf
    • https://galojegada.weebly.com/uploads/1/3/4/3/134364802/6ac51.pdf
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/murovulakewib.pdf
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/455c63.pdf
    • http://tideboweped.medianewsonline.com/alison_smith_sewing_book.pdf
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/3712715.pdf
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/tufaminemilovi.pdf
    • https://cdn-cms.f-static.net/uploads/4451737/normal_6067d751291f0.pdf
    • http://povisowalikim.scienceontheweb.net/kamus_indonesia_arab_terlengkap.pdf
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/wowifizari-jomuvijedirase-mexefumuzelob.pdf
    • http://mazezoda.22web.org/kipapuwuko.pdf
    • https://fezizijopugasu.weebly.com/uploads/1/3/4/8/134850826/7003199.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://danasavej.epizy.com/beloved_1998_movie.pdf
    • http://guxijukamudeze.epizy.com/86914550932.pdf
    • http://polabufu.myartsonline.com/essential_hematology_book.pdf
    • http://perexuwofogefo.onlinewebshop.net/canon_in_d_violin_and_piano_sheet_music.pdf
    • http://lewafozilit.epizy.com/mr._coffee_coffee_maker_reviews.pdf
    • http://palexibibiw.atwebpages.com/anti_corruption_policy.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_off0000eb9f.bin
3ff0c0f5d49ac44ab8150305b4244263231c7d988b0c8188f6674e53e456b8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5304 bytes
font_01_sfnt_off0000fd98.bin
62e98577dc793c66a45d0b7ed8ca22da2644f934f43af4e950eb1ab64d55d344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10496 bytes

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