Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cdb78b8d63916…

MALICIOUS

PDF

71.1 KB Created: 2021-03-14 04:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 921b14d27b608f44f2b36ecf1cc8a41f SHA-1: 1852df6f98ed82cf03b21c402bc8337eaab6e785 SHA-256: 4c4cdb78b8d63916b2ac1297c2b33b42c7e26e7dc9b56c0a56b6306b52f9b66d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious or phishing websites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lozipotod.ru/wix?keyword=2019+calendar+2020+printable PDF link annotation
    • http://card2card.live/chistes_buenos_2019hawn1.pdfIn PDF document text
    • http://betmoy54.com/488477169058e87u.pdfIn PDF document text
    • http://copyright-services-us.com/how_to_learn_jiu_jitsu_at_home5i6qu.pdfIn PDF document text
    • http://fruktovik.com/assassin_s_creed_rebellion_equipment_guide8giuv.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/negokuvodusa.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/1849020.pdfIn PDF document text
    • http://the-glow.ru/64187486767630k3.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/69P7agf/dolakinokeduxanifat.pdfIn PDF document text
    • http://ropiwijubasa.22web.org/alesis_dm6_set_up.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/ihcbAYL/livery_templates_bus_simulator_als.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/budokaworesapakevo.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/4Fgiigy/disney_anime_app_icon.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/kutawijunemefin-mupazere-genexuvep-kofupulivekig.pdfIn PDF document text
    • https://kesobimagebow.weebly.com/uploads/1/3/5/9/135978915/fovifu.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/eaoMFgc/vibefovejexokobofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemuvatixas.epizy.com/38435762654.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/online_fire_report_up.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_c615673181e349c0ac1b29ac5640d418.pdf?index=trueIn PDF document text
    • http://xupikilagi.rf.gd/85221363313.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_d8b56ed5d02b4c7bbb4840b362be221d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/98646276971.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/36893529221.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_df1ec565ee074bc2859061415f19de5b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 5416 bytes
SHA-256: ed2bec508f78422b96199679868f5a3e118172c53d79548e1412da76a599fec5
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10336 bytes
SHA-256: 3d474c9f381772f6e2d591bc72670efa7985f35d9a261fbbe93f996922c0e15d