Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa21835584105edb…

MALICIOUS

PDF

80.5 KB Created: 2021-03-14 15:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725663c15a20c9d068ba6a9bdc04be77 SHA-1: 47515e8f1ca3755470ecfb62f39becdf2fffd4ba SHA-256: aa21835584105edbe6ba0293be5aab942024b9a2311e8f335ec4545d319824ea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links, including one pointing to 'https://nipisod.ru/wix?keyword=mana+mariposa+traicionera+chords'. This suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=mana+mariposa+traicionera+chords
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/8285442.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/lukunawawule-pamurowuvota-topeniwiw-zakijemopazovib.pdf
    • http://cardio-natural.info/will_elgato_hd60_pro_work_with_ps5dbe4x.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_6030a2dab76f5.pdf
    • http://robolab.one/linda_s_costanzo_physiology_free_downloadlraho.pdf
    • http://losinglotterynumbers.com/happy_birthday_to_upffx2.pdf
    • http://naturaleone.space/9294449749634bf7.pdf
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5ff281506612a.pdf
    • https://cdn-cms.f-static.net/uploads/4455681/normal_60470ca16c8a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/games_2018_new.pdf
    • https://s3.amazonaws.com/sewamos/rumikem.pdf
    • https://s3.amazonaws.com/xakapudakadu/guess_the_brand_pack_1_level_24.pdf
    • https://uploads.strikinglycdn.com/files/67977ed3-2c2c-44f3-af25-dac7cfe4ecae/bujovewezus.pdf
    • https://s3.amazonaws.com/sowirutelevolur/free_storyboard_pro_software.pdf
    • https://uploads.strikinglycdn.com/files/93b359b6-6941-4325-a8dd-0d10c31af4bd/mazizafejav.pdf
    • https://s3.amazonaws.com/lofese/roweguzapoje.pdf
    • https://uploads.strikinglycdn.com/files/69617de1-67c3-41f5-b9b8-1cbcdce4fea2/86669539774.pdf
    • https://uploads.strikinglycdn.com/files/31eca039-cad7-4bce-b3c2-258b1794396a/luxaxuwasibej.pdf
    • https://uploads.strikinglycdn.com/files/96031b97-9e42-4758-9c88-ba21679a7973/principales_problemas_economicos_en_mexico.pdf
    • https://uploads.strikinglycdn.com/files/e21b6c72-c935-4c8f-8b22-96c9739aa6d2/mirro_pressure_canner_parts_m_0522.pdf
    • https://uploads.strikinglycdn.com/files/214d86a5-d093-4746-99d2-af03d241b63f/wukisazaboji.pdf
    • https://uploads.strikinglycdn.com/files/6d101883-3382-431b-ac4c-ee25a28989b4/xapunupebamekilanonapoke.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e597.bin
06dfd679e882533cf3aa41b3f4a8da9813850681b46fedc85b9b098cbee2a569
pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 5288 bytes
font_01_sfnt_off0000f76e.bin
1e4c63c338ad15485f0cbb203cbc4483736d2fc20c8ecb45bd9d3a15cd72b52b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 11504 bytes
font_02_sfnt_off00011d62.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16204 bytes