Malicious PDF — malware analysis report

Static analysis result for SHA-256 0841e33f1d662f98…

MALICIOUS

PDF

68.4 KB Created: 2021-05-16 00:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6389d79fb1400832668b7bd68eeda322 SHA-1: e157604d4d977c9feab17dbe82adb37955950932 SHA-256: 0841e33f1d662f9846f5664006d075e48d99b2fc079eb6addc2f9dbd4b5a582d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=business+vocabulary+in+use+intermediate+bill+mascull PDF link annotation
    • http://bupro.asia/xigikavuvutotawuzibimxzbq.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/d5NhgPK/early_bird_landscaping_wirral.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/MqvFjcf/62366600570.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/aiisZgc/bazubonowigesafola.pdfIn PDF document text
    • http://epipog.com/416869198637a4q.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/fREduic/steampunk_tower_defense_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/jmyhejd/20003393535.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/QajaPvw/directv_now_channel_lineup_changes.pdfIn PDF document text
    • https://cdn.sqhk.co/netomivoku/mShs11B/best_body_photo.pdfIn PDF document text
    • https://cdn.sqhk.co/melobokodijo/hgdAhhH/waboraxivojuxumeb.pdfIn PDF document text
    • http://aycotoro5.xyz/audi_q5_2020_owners_manualnroum.pdfIn PDF document text
    • http://flebolog24.com/how_to_start_playing_tennise7gse.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/55hi16Y/century_arms_c39v2_scope_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/BYviewv/31215312151.pdfIn PDF document text
    • http://ig-socialmedia.xyz/strymon_deco_vs_el_capistanne587.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/sowewazulejewi/zigusunolakanavagitelexot.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/hamilton_beach_flexbrew_carafe_instructions.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_1a8f9ca6d0c144c58895aef1aa23a892.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_d9a38af993f64f8893ddf74806ff3cb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/avery_templates_for_mac_word_2011.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_a17760df253b4c26a185f3f44c64d42b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/79142862266.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/28269579039.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 5436 bytes
SHA-256: 95b0ba29049c5f018d2133aa93d063eba87921769667d2d0ef1e9b679f7ac507
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 9948 bytes
SHA-256: 68c2598e823e9486061e461372d87cb1eb88939e5728c0efd1284e9ac3273550