Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5151c47016504c…

MALICIOUS

PDF

114.1 KB Created: 2021-02-16 06:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 501540860df9ad2d050b37a19bde9e94 SHA-1: 29e5d1b1137ebcf6dffd22e28c1fc20eae5f351b SHA-256: 0b5151c47016504c258412557a51c6df104b30a5e0765b6e92f20750dda03d37
186 Risk Score

Malware Insights

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

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 0.9996

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://baarspo.ru/strik?utm_term=the+book+of+life+2014+wikipedia PDF link annotation
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/2748379.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/3310772d834.pdfIn PDF document text
    • http://srakan.space/how_to_update_a_mobile_homelahbz.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/c1a24cc0b.pdfIn PDF document text
    • http://reznitskygallery.com/what_is_the_main_message_of_1984ok21x.pdfIn PDF document text
    • https://kifadinegek.weebly.com/uploads/1/3/1/4/131407901/korisat-wujufilaxa-noladojabefugut.pdfIn PDF document text
    • http://bonboxstudio.com/harbor_skyrim_togetherkwhe8.pdfIn PDF document text
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/vidijeluvugozuz_jigagurorof.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/vofexikif_lusekize_bisepogatenok.pdfIn PDF document text
    • http://luminar4-download.xyz/75096254199b6zle.pdfIn PDF document text
    • http://deemonatrafik.xyz/95516869341bxhl0.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/1468442.pdfIn PDF document text
    • http://train-home.ru/wirusajapopovoxatujelexarcnuo.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/kuwadibogatovo-didudo.pdfIn PDF document text
    • http://arenaprobet.com/anomalies_placentaires3d9mz.pdfIn PDF document text
    • https://wikusujuvi.weebly.com/uploads/1/3/1/4/131406665/6455929.pdfIn PDF document text
    • http://loveworld.club/worksheet_atomic_structure_chemistry_a_study_of_matter9fj0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/jotunheimen_hiking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/horizon_ct5_2_treadmill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/e._y._e_divine_cybermancy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/35750422539.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018c44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18C44 26364 bytes
SHA-256: a81e79f202fbd4ed0c7d0fe54ba4d64e6941cd290c061ad6e7ef38cecf387f7c
font_00_sfnt_off00014f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4A 5512 bytes
SHA-256: 119ffe028b736bb0fc9406eb9210b8896bba0a35194323993e7bb55f43ad66ff
font_01_sfnt_off00016226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16226 12684 bytes
SHA-256: d9f8f36770bdaeef82183bb9f547903b298eea5cf74beaa9d52dbf28a75816e4