Malicious PDF — malware analysis report

Static analysis result for SHA-256 115a87e863df3c20…

MALICIOUS

PDF

71.3 KB Created: 2021-03-28 10:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7db4e39b513d661f88e4a52c81ccec1 SHA-1: 075518397daa9bc409ce3f95d8dff70d5e3562b3 SHA-256: 115a87e863df3c2003984f254be21b483a24803d8b772db1ce24ad8a0cb8832e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to attract traffic, and the presence of external URIs suggests redirection to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://ponafet.ru/123?utm_term=aluminum+boat+design+pdf
    • http://sakulog.sportsontheweb.net/speedbit_video_accelerator_activation_code_keygen.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/kuviduvo_kedosurilus_xukemi.pdf
    • http://xexogafuko.22web.org/terukeruzipu.pdf
    • http://winoraama.site/178423924358wtu8.pdf
    • http://pobesegu.scienceontheweb.net/bell_palsy_treatment_exercises.pdf
    • http://nuvotana.22web.org/love_in_the_time_of_cholera_literary_criticism.pdf
    • http://4bochki.ru/how_you_say_bus_driver_in_spanishg37rq.pdf
    • http://linza.media/will_there_be_a_nerve_2eej7e.pdf
    • http://zixefeninano.22web.org/bajuvajudituxu.pdf
    • http://pazefezos.mywebcommunity.org/acute_myeloid_leukemia_case_study.pdf
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/3263476.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotenu/bazan.pdf
    • https://s3.amazonaws.com/gekixadonuru/how_to_use_brother_scanner_dsmobile_720d.pdf
    • http://mupowazige.rf.gd/furatukopikiraxi.pdf
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_45d55edd51fe44b39590b3e7c18ee0c6.pdf?index=true
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_ee38deb8ffe74617bdf279b275b22162.pdf?index=true
    • https://s3.amazonaws.com/wolina/tinepikadikubedutamaj.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_off0000da88.bin
a6033571246380970f358249f5ad56421d0eb9a773af987157ab3c51a7d98094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5392 bytes
font_01_sfnt_off0000eccf.bin
98313c5a3420caa7274f4658738d5a7c859107d7dd41fa1b5f8001d98513297a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 10428 bytes

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