Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3e868577c9c41d…

MALICIOUS

PDF

85.4 KB Created: 2021-04-28 11:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e7961c87e96997a10e3a50fff97bf86f SHA-1: 83cdb4ef34625b7d87b06e34ea87884e0139ec46 SHA-256: ab3e868577c9c41d863b8bb4fab5996d4f380f9ddd60c50f9d21fb3c8a248297
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to deceive users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=porter+cable+dovetail+jig+4216+instructions PDF link annotation
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/buneriwawuvarel.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/fb1ce2c73.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/sasume.pdfIn PDF document text
    • http://wuguxij.iblogger.org/1580448395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravawubiralimiw.rf.gd/32251510158.pdfIn PDF document text
    • http://pulijivugis.epizy.com/87199089934.pdfIn PDF document text
    • http://judejelalub.rf.gd/mini_split_heat_pump_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5e72a5-8a15-45a5-aeff-26c17ac1497c/what_is_the_difference_between_a_niche_and_habitat.pdfIn PDF document text
    • http://nozabikuj.rf.gd/data_structures_and_algorithms_gate_questions_with_answers.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_5e4435c4486e4b3e9b6bf811cbf87fca.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_a0fd8647fc5347608f93f53319cb5edf.pdf?index=trueIn PDF document text
    • https://b1fdf235-84a1-4479-ba44-7fc4a4f983d7.filesusr.com/ugd/afcd87_b8a12e1f74024b81baddc907a93b6d47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efad8920-2e27-4fd5-a826-bcf4086cad67/midnight_sun_cast_twilight.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_ad453d7da1a442a8873247e41fedfc9a.pdf?index=trueIn PDF document text
    • http://sajojabop.epizy.com/sogawitiritetox.pdfIn PDF document text
    • http://xigurig.rf.gd/magowofajijiminabasop.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a124952eba564b0dace4ca60dc893706.pdf?index=trueIn PDF document text
    • http://danuxobuzo.rf.gd/alter_ego_1_plus.pdfIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_1744dba2bea048efa3277f345a6dea7f.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_3ed7b3ff3bef45668d70ccd65dc43246.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_33872af381334449990839bbe4dd5891.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_fb18bd1079e6444182854e3ccd6f96ca.pdf?index=trueIn PDF document text
    • http://kixukad.epizy.com/aimersoft_video_converter_full.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5812 bytes
SHA-256: a693de832715bac25cbf44d6e4672f047fee1ae97837e4c7be3c6f0967ddcfbb
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 11412 bytes
SHA-256: 844266e6dc8be0994502a7a35f5eba77fad50eaa6cf04e1910991e54b42eb658
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828