Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a3144907626494…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 20:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76d62e4daedfc3ccd7937c3843ba9b03 SHA-1: c137425458c31afd2568f5c9ef4447b0379f937f SHA-256: b8a3144907626494dc2e09606b309fb8cb795d7485a9c9a5460c39b637aadd11
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=cuento+la+almohada+de+plumas+pdf PDF link annotation
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/6bb141.pdfIn PDF document text
    • http://dotupimulax.iblogger.org/moto_g6_not_ringing.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/lifehacker_editor.pdfIn PDF document text
    • https://lavowoluxep.weebly.com/uploads/1/3/5/3/135388351/lowadex.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/behavioral_management_theory.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/c60b69cf4.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/ramai_awas_yojana_application_form.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/xikologuwaseb-mapepikenofewa-vozoguji-fiweni.pdfIn PDF document text
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/7874879.pdfIn PDF document text
    • http://jemofukamuwol.22web.org/14822610855.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/pdf_editor_text_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/28502247005.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/biodiversity_and_its_conservation_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58677dd6-9fd8-442e-9784-6d8d6d964c7d/transformational_leadership_styles_in_education.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/adjectif_interrogatif_exercices.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/despacito_song_tune_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab57a60-6eb2-4cec-bafb-a50f766e6c70/kenmore_elite_81714_canister_vacuum._bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a8631a-dce9-48cd-9dfb-328bb2115300/ross_stores_open_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63769376-3210-4fb2-8a0b-838ed80786a6/national_highway_safety_administration_promo_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0e1815-ea07-4fba-bdbb-7a5793ccb0c4/27567290791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d81f6ee-de42-4b33-8a53-27878ecc195b/real_estate_broker_exam_reviewer.pdfIn PDF document text
    • http://wegarasuw.epizy.com/rosogolla_bengali_film_songs.pdfIn PDF document text
    • http://gidazajizi.rf.gd/editorial_writing_filipino_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c085ef9-782c-4356-bfa3-3e97e1565ba6/6531009447.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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5088 bytes
SHA-256: f3de4e8e67fc6b89872e2abe2c8afaea5372a7e506589a5642f470e389746567
font_01_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 11588 bytes
SHA-256: 38ac9a3146dffb29c3d0595610dfc88f94d8e877caca97eb859ec7fb42b7b77b