Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca3401c7f6a3bad…

MALICIOUS

PDF

79.8 KB Created: 2021-05-25 17:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b21df421221e4b665d8b8b3dff0952fd SHA-1: 5929127b96de8e9b73250bc1d8b0a463535b056e SHA-256: bca3401c7f6a3badc390bb23674118eb35ec4b33bd81dd264d9acbfc0a4e1015
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with a primary focus on a redirector URL (https://zajinet.ru/strik?utm_term=cronograma+fisico+de+obra+pdf) and a link farm pointing to other PDF files, suggesting a campaign to distribute malicious content. The presence of embedded external URIs and the overall structure points towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=cronograma+fisico+de+obra+pdf PDF link annotation
    • https://dovimivezo.weebly.com/uploads/1/3/4/3/134327865/telalulewetir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5ff15651773dd.pdfIn PDF document text
    • https://puliwavigajog.weebly.com/uploads/1/3/4/4/134469254/gubojikujadimov.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/xogugumebit_lalufuz_ribator_kobuziwif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_603faddb3aef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fe8400ed55b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5fd96b7b3d8dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_600f835ba76f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f37c88-fa2f-45cc-bb23-13bada834605/79106005134.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/27205630930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77eba55e-2062-4f32-bc69-e7be50738988/maths_all_formulas_of_class_11_and_12.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/vetagitepupowenuneramuzet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a0c731-8715-4933-ba8f-879a84fc4243/what_easy_exercises_burn_belly_fat.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/is_google_translate_good_for_korean.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/santoshi_mata_ji_ki_aarti.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/asuran_bgm_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/finubirinaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72864c65-0e91-4c76-bc61-c91dbf7fe7c3/michigan_law_regarding_guardian_ad_litem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18b675c-31b6-4f0b-8a99-40c33dad2c95/what_is_the_moral_of_the_story_three_questions_by_leo_tolstoy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff78589-26c7-4817-bbbc-d811696805c7/nenuzenerikig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8016a5-6c84-42f0-937c-d5e7d59f4232/poulan_pro_260_chainsaw_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27bcafc-fae2-48ae-99f8-38f50cb9eeab/syllabus_of_class_12th_physics_jkbose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f154a0-2951-40e1-ad8a-fbf2599b3f64/how_to_reset_canon_mx390_ink_level.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_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 5488 bytes
SHA-256: 17456dd8d21ca2c46fdb060e6c869547333ed76d681ff5d46dd5f2db594b7cb8
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 12332 bytes
SHA-256: 55cf828dedf109052f9a90603f4b2730f570225ed4cce2c62b13cd4d774cb31e

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