Malicious PDF — malware analysis report

Static analysis result for SHA-256 902048c9c6253992…

MALICIOUS

PDF

79.2 KB Created: 2021-02-19 10:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: eb331bc24959e90efae19a954b99ed65 SHA-1: 5bea309107faf7bb9d9f4b9abe9f24844c1bb5ed SHA-256: 902048c9c62539929c2fee6efd3ba727f36a45736d045969852d37beb714fe8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm or SEO spam campaign, with one prominent URL being https://leonvi.ru/wix?keyword=read+the+notebook+online+free+pdf. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded links suggest an attempt to redirect users to malicious websites, likely for phishing or to serve further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=read+the+notebook+online+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fc5e79518e4e.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/799171.pdfIn PDF document text
    • https://ditezuni.weebly.com/uploads/1/3/5/3/135350757/mifutasiwonufod_wazadodus_zikewezadijaw_botapomexoz.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/lhhywjc/3d_printed_pinball.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fdfb1a8077ad.pdfIn PDF document text
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/6606323.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/TeRO4tf/rumble_on_stock_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6023ed20704e2.pdfIn PDF document text
    • http://garowige.iblogger.org/kakshi_amminipilla_song.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/hifgdgi/11310278435.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/bulolimepol/debridement_coding_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/videoshow_pro_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/whatsapp_for_pc_terbaru_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/92185929720.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/uniformly_accelerated_motion_example_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/change_currency_symbol_google_sheets.pdfIn PDF document text
    • http://lebiwubeso.rf.gd/hepatitis_a_cdc_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/terivadijofipoforadubuti.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/malibu_nights_piano_sheet_music_free.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_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 5160 bytes
SHA-256: 1af88393491be1920af7d8fadac11023625f2ee5df57d90fd5ce7369d4416d54
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 10644 bytes
SHA-256: 76ba4e690ec3f919d34bdf9b9936f2f2095cdac80acb493671e046081bc3c351

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