Malicious PDF — malware analysis report

Static analysis result for SHA-256 af329ee34f52daf0…

MALICIOUS

PDF

86.6 KB Created: 2021-06-10 14:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 62bd132bf04f7cbe676bd7fc34f6e2c2 SHA-1: b7a0f0b64d4c8ec83d018747173a0621a1780baf SHA-256: af329ee34f52daf01caa65ad3f971b0d94c29f650f48b9105798da6ddda4d04e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=folic+acid+dosage+forms PDF link annotation
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/5284bb427a33c00.pdfIn PDF document text
    • https://ropababiw.weebly.com/uploads/1/3/4/6/134667017/zidewodosibax-ruseteresib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fca30469e04e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fdd8611d42b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6050e99bddb57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5feda216cbb45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_606e51021b2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_60392b43afe7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fd9d1235a84d.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/5990775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_605a4a052f029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449421/normal_6002638696dcd.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/mirusopivi.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/6801281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_601fe62fe40bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexufak.pbworks.com/f/reritodejudetatofip.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/pokemon_xy_series_all_episodes_in_hindi_dead_toons.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/nanevozekiruj.pdfIn PDF document text
    • http://negekovav.pbworks.com/f/tour_of_the_electromagnetic_spectrum_worksheet_answer_key.pdfIn PDF document text
    • http://waxijoruv.pbworks.com/f/15433762526.pdfIn PDF document text
    • http://posonuxe.pbworks.com/w/file/fetch/144720864/81531202999.pdfIn PDF document text
    • http://zawepiko.pbworks.com/w/file/fetch/144598860/how_to_calculate_profit_from_lot_size.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/rogatuwanuwijapinopal.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144501705/wolf_online_super_mod_apk_download.pdfIn PDF document text
    • http://gibudufu.pbworks.com/w/file/fetch/144588558/93212304497.pdfIn PDF document text
    • http://vesusezipuwe.pbworks.com/f/how_to_retract_a_letter_of_resignation.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144472866/animal_behavior_an_evolutionary_approach_9th_edition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 5296 bytes
SHA-256: 0f2ff52bea9f8289a921dbac5fa06a071986eb5dedef044e9277a231fad289c3
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10680 bytes
SHA-256: d07f6870b731dcae2e998a751e383f297de7ace7fcdcf95a8759a691abb5a75e
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb