Malicious PDF — malware analysis report

Static analysis result for SHA-256 840c056a474d1c6a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 10:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6d08252beb50b59184677725ef0b08f SHA-1: 6d5abd07b065f712cd0d2d92906efc5c62108f48 SHA-256: 840c056a474d1c6a811ca27929d0e19ba4b6e242f0007c3783092f91a23ed38d
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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://leonvi.ru/123?utm_term=imsva+9.+1+admin+guide
    • https://cdn.sqhk.co/sozovoja/csgi1ia/9126188690.pdf
    • https://cdn.sqhk.co/gozolijitow/FaRa0ii/live_cricket_streaming_cwc_2019_star_sports.pdf
    • http://mesikigodijope.mypressonline.com/figuzonixo.pdf
    • http://clientesdkb.com/vekejabfyz1u.pdf
    • http://prizinsta.online/59653418592y1quz.pdf
    • http://indital.fun/imagine_dragons_believer_sheet_music_easy1f1qc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bakoloj/7th_imo_answer_key_set_b.pdf
    • https://2172aa7b-56d6-4bcb-a12f-aafeda7c7725.filesusr.com/ugd/0d9129_7702b8c668cd45ed94d2aad2026791f2.pdf?index=true
    • http://sarutufasiko.atwebpages.com/think_and_grow_rich_original_audiobook_free.pdf
    • https://s3.amazonaws.com/kubafezin/3042202843.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_c14358a54dec48dcb85e28916c729b67.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_2bfaf0f904cd438c985266263b0eeaa5.pdf?index=true
    • https://s3.amazonaws.com/dutuzanob/nekunowugonazefotajasuz.pdf
    • https://s3.amazonaws.com/viregujipowuru/baby_girl_clothing_3-6_months.pdf
    • https://s3.amazonaws.com/juzinaramip/rifuvorolufotupita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e182.bin
3670b5c829a88a6a390d9026e0a9724cf587407d01436f0edc86dcfcc46b78cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 4948 bytes
font_01_sfnt_off0000f23b.bin
bd1a7579e6a0c5640c9981356e2ae1d019ca319ec3f18802da2f45d0036afed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 11192 bytes
font_02_sfnt_off0001184d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 4324 bytes

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