Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56b6de4f2dbf188…

MALICIOUS

PDF

79.5 KB Created: 2021-03-26 07:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c77a73d8acf62e6ed63b70d2f65988a SHA-1: dddee297d29e8ea5deddaed81ea2d668c4ed8f24 SHA-256: d56b6de4f2dbf188bb6720a5fc6e8340f08b59871607d9ef23a8d52fae7bfb27
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'zajinet.ru', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=harman+kardon+avr+347+remote+control
    • https://cdn.sqhk.co/lamajemomu/nE1Ljdj/magogofok.pdf
    • https://cdn.sqhk.co/ropobemuma/XWG3ggh/zombie_hell_arcade_fps_shooter_games_unblocked.pdf
    • https://cdn.sqhk.co/mogizufofuj/lV3jdgR/definition_of_religion_in_sociology.pdf
    • https://cdn.sqhk.co/wixumenez/ELQWjaj/dozerasumidap.pdf
    • https://cdn.sqhk.co/limiwebu/9GHjhA7/tickets_for_planet_earth_2.pdf
    • https://cdn.sqhk.co/podoxato/QbQxgen/14922831743.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_7451bd4485764fb1a05be4ed4ca051bb.pdf?index=true
    • https://s3.amazonaws.com/nuxulikiwab/challa_song_amrita_virk.pdf
    • https://s3.amazonaws.com/bisiku/kizapisaxoxagibal.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_4d70c12ca1a243039bdb6dce7379a76b.pdf?index=true
    • https://s3.amazonaws.com/bulalowisu/damemenaxitad.pdf
    • https://s3.amazonaws.com/kulinisokakewi/30522088725.pdf
    • https://uploads.strikinglycdn.com/files/a87962cd-e67d-4fc8-b1ae-f46931f4f024/tivitujowololazov.pdf
    • http://zekovulelopur.epizy.com/boutonniere_deformity_thumb_radiology.pdf
    • https://uploads.strikinglycdn.com/files/9bc8441f-3eaa-4741-a569-16f8b1523e5c/plant_physiology_biochemistry_and_biotechnology.pdf
    • http://xinonot.epizy.com/basozalakivejobuk.pdf
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_fdc5d493538541f393b5be1d85fbd1f2.pdf?index=true
    • https://s3.amazonaws.com/dazuxujepov/vixejirosev.pdf
    • https://uploads.strikinglycdn.com/files/be0ca12f-465f-4ed6-95fd-a3efc00ad508/how_would_you_describe_the_moonlight_sonata_on_piano_easy_slow.pdf
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_9795ea498c0d448db2a3b0f3f568543a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7d0e35b-2af2-4aff-9d98-6de188bd3962/legopegakijowujomutodaseg.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_off0000f6f1.bin
dea69c22348a064e75e561d4fdc31a76732375d213d1cd42c264873a9165fad9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5324 bytes
font_01_sfnt_off0001090e.bin
be77818df8b48a311044e74d18f950d7133ddb4453e0dcc73613517913f48368
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 10984 bytes