Malicious PDF — malware analysis report

Static analysis result for SHA-256 a103e7011c77e67b…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 13:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 53f5d965cc6c57518d25450afc4e906d SHA-1: b7fef867b030cfe997fb6afd00407b5facae773d SHA-256: a103e7011c77e67b9e24ac81da8036160e64de41d700c04124e4460785d200f2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=advanced+engineering+mathematics+topics PDF link annotation
    • https://cdn.sqhk.co/luwanuriwaba/d53Igo1/canada_area_code_724_map.pdfIn PDF document text
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/334991.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/UichgtP/12143492916.pdfIn PDF document text
    • https://palobakuk.weebly.com/uploads/1/3/4/5/134523632/mujusisopas_nipisajaxasufa.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/m1Jy1tX/83131335816.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/ghbRXR5/masat.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/1a69b3ea96.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/9jshgCF/ice_crushing_machine_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/95gegc3/new_ringtone_2019_download_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/9hgiHbx/launcher_mod_apk_no_ads.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/zunit.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/ab9389674.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/tRghjen/tokivokofexajex.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jceie7J/lovidelabalis.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/fd01f2fc33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7e073422-413b-440b-9c34-b7dcafd32264/filtrete_3m_thermostat_wifi_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/65829440848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49718db8-47c9-44cb-892d-c633c6c997de/24878217152.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/48421956381.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/61998988617.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 5292 bytes
SHA-256: c41f633a37023beae3f7655a8b6189ec395a4c5f1cc1e52771909f99e64e249e
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 11408 bytes
SHA-256: 951f035f3ba4597acaf0c665ba2b0c3b4b286287fc425d4c6326a70a52af3414
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f