Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa85740f1be1db66…

MALICIOUS

PDF

81.0 KB Created: 2021-03-01 12:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5372b2aa5e7dcee1e0a5adb07823f311 SHA-1: eb808f8a0ccd38ea939d9407474d3e561fc06b52 SHA-256: fa85740f1be1db666466a4d92706bfedc6ef8138dc99fc6f91922c0969e22780
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. A critical heuristic identified it as a link farm containing numerous external PDF links, with one pointing to 'nipisod.ru'. Additionally, a high-severity heuristic indicates a lure to execute commands via the clipboard, suggesting an attempt to trick the user into running malicious code. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://nipisod.ru/123?utm_term=high+school+dna+structure+and+replication+worksheet+answers+key PDF link annotation
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/5434530.pdfIn PDF document text
    • http://gaydating.world/nigizusirunakanigawgxv58.pdfIn PDF document text
    • http://dombitarf.ru/bruce_lee_the_fighter_songs_starmusiqs9ase.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/9524431.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/6ebe9678b87.pdfIn PDF document text
    • http://mushygushysayings.com/o_que_e_pesquisa_bibliografica9r53p.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/1169694.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/polexebuj/newspaper_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/56396052012.pdfIn PDF document text
    • http://zomufebike.epizy.com/final_fantasy_liege_of_the_lake_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/63092730683.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/best_fishing_pole_for_fresh_and_saltwater.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/how_to_train_chest_with_ac_joint_injury.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/85776726374.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/living_up_the_street_by_gary_soto.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bavarian_autosport_code_reader_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 1712 bytes
SHA-256: 2573ba3dc413a71f166e7e7d7cc0106b583dbeda74e41e7f2bfe02906d3a43a1
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 5436 bytes
SHA-256: a227c4a84aeea06ed131e051a37babf0566d22612710099c56f0a6a019eb9c95
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10488 bytes
SHA-256: 14b0c25a000655eaf07420c7c8b0dc6858d523767c35f92e4218a6f22d02c05a
font_03_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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