Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e3c4f50c5de8e2…

MALICIOUS

PDF

86.1 KB Created: 2021-03-16 11:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55373956814c9e1e8ba47843a98c54ea SHA-1: 77b1258433c45a768640707a298ddec71df9fd04 SHA-256: 03e3c4f50c5de8e2d99eef273e17e90366fe2d6f2d33cac6edcbeed286f5babf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=what+are+the+flowchart+symbols+and+its+use
    • https://cdn.sqhk.co/susotizakaxe/5A3ZiiV/39562982593.pdf
    • https://cdn.sqhk.co/wufevinek/DZ4FhbW/45384776135.pdf
    • https://cdn.sqhk.co/soxesemu/jmhdVhj/1233667011.pdf
    • http://foramodosug.mygamesonline.org/walt_whitman_calamus.pdf
    • https://cdn.sqhk.co/kopilixa/jaogchC/wurifuleludafed.pdf
    • https://cdn.sqhk.co/retuwami/giehahh/fan_the_game_mod_apk_2019.pdf
    • https://cdn.sqhk.co/fubebevukad/hfghyhb/mastery_point_gw2_guide.pdf
    • https://cdn.sqhk.co/lewoxiguj/PY0zhhg/park_tool_master_tool_kit_mk-_278.pdf
    • https://cdn.sqhk.co/minofavazu/3Qjcxgg/hitman_2_sniper_assassin_the_last_yardbird.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satovimowenijor.myartsonline.com/nudup.pdf
    • http://badamowafe.onlinewebshop.net/pathfinder_ranged_tactics_toolbox.pdf
    • http://gixopiv.onlinewebshop.net/ray_bradbury_theater_the_pedestrian.pdf
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_ef96db771d7c4f2d842382d09eefd779.pdf?index=true
    • http://xobibaga.myartsonline.com/genie_model_3053_installation.pdf
    • https://uploads.strikinglycdn.com/files/ae3a8ddc-c607-48d9-b8bd-14a7b222317b/81733716561.pdf
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_df9a420c5d1d43429c86b47cd51e1346.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e370027-f0ed-413e-adb8-4ee5e3617194/junie_b_jones_read_aloud_book_1.pdf
    • http://kewevagisugimuw.onlinewebshop.net/why_does_my_sony_sound_bar_cut_out.pdf
    • http://mepitar.atwebpages.com/miles_reid_undergraduate_algebraic_geometry.pdf
    • https://uploads.strikinglycdn.com/files/f36d81f7-b4aa-4475-b4ad-a7ba0d767317/mendota_fv44i_gas_fireplace_insert_reviews.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_off00011149.bin
7872da19d068084ffa42b5f44d6051283d47ed5d27c44c495a1faa7afcbd306d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 5608 bytes
font_01_sfnt_off0001244b.bin
2cf4f569604ed286dd8150076c075104528536307f3779f9321a3df1ff25ef99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10964 bytes

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