Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e337edc66965c70…

MALICIOUS

PDF

80.6 KB Created: 2021-04-08 18:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63f64db770a4bf7fc8e04c2e735339b SHA-1: d0a1e17fe07e8e0cff4ad9912c5766ede80ebb18 SHA-256: 5e337edc66965c70d76e5ead19b7856d3d5e149b6b7ca4f2a7007cd3952a1f2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF URI' and 'PDF SEO LINK FARM' heuristic. The primary URL, 'https://nipisod.ru/strik?utm_term=how+much+does+court+wedding+cost+in+nigeria', and the first link in the farm, 'http://topcreditscore.info/silhouettes_from_the_hunger_games_catching_fire_soundtrackvt016.pdf', are suspicious. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further indicates malicious intent, likely related to phishing or a trojanized document.

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://nipisod.ru/strik?utm_term=how+much+does+court+wedding+cost+in+nigeria
    • http://topcreditscore.info/silhouettes_from_the_hunger_games_catching_fire_soundtrackvt016.pdf
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/8b9af582d8fb.pdf
    • http://bupetud.xyz/philips_series_5000_beard_and_stubble_trimmer_bt5502_13_reviewbnb3d.pdf
    • https://limotesatax.weebly.com/uploads/1/3/1/8/131871768/2635132.pdf
    • http://wojisub.mypressonline.com/audit_of_joint_stock_company.pdf
    • http://copyrighthelpptteam.com/21226361920ddtcr.pdf
    • https://zavinuso.weebly.com/uploads/1/3/4/4/134461772/4298481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_9c41635a638141839ae41f67d9aa9bf5.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_dec0ae4a77da4e5188bb8af220507774.pdf?index=true
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_ff8288b982ae47f4820092d849480774.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_33db10c7516249f4a469d138ef637191.pdf?index=true
    • http://xomapagovujux.atwebpages.com/bhima_koregaon_history_in_marathi.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_1c30bb394b70419981fce56aa87b9313.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_a3326cac05bd4e9982ea359f6841e695.pdf?index=true
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_70fb6a1ee6fb4cbfb1b1e2c54bc85d1d.pdf?index=true
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_9933dad645e543b3a8fb489111d5c4f8.pdf?index=true
    • 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_off0000ef6d.bin
6c0ebdb2d4edd38c4073cd26d5167ac56c9b1dfd25cdec2642221ed33f8ef476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5256 bytes
font_01_sfnt_off0001012b.bin
e8bd2a1cd8817c64e9bc529f467628f8593d636332d6f9bd81fa35794629aac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 11328 bytes
font_02_sfnt_off0001272d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 4324 bytes

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