Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ddf98d15ce570b…

MALICIOUS

PDF

71.0 KB Created: 2021-02-26 22:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a016885eb6837b66365971dacf44270 SHA-1: 0cd9041f7ae038b995a309d4b070301dcf38aea4 SHA-256: 11ddf98d15ce570b3282d8ea608ea18b99777a24c0e09f950feb4af90ff40b2e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=psychology+applied+to+teaching+14th+edition+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fe21cfdb148b.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/ha4x7ha/ikea_desk_legs_out_of_stock.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fd3c1b6aea5e.pdfIn PDF document text
    • http://bestsalestoday.xyz/32826030434xd2mg.pdfIn PDF document text
    • https://dodonebonobegep.weebly.com/uploads/1/3/4/5/134597525/pelopekobipati_damitilalaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5fe2133100d11.pdfIn PDF document text
    • https://setanalad.weebly.com/uploads/1/3/0/7/130775470/sasesiki_devodeg.pdfIn PDF document text
    • http://quickstore.pro/81148172596wgi1o.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/gVLNgfl/rudibumilimesuro.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/bc465348ea16c89.pdfIn PDF document text
    • http://organize.shop/27165854451co7sd.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/hgijcij/geloxapifojagom.pdfIn PDF document text
    • http://leoidet.xyz/cfd_analysis_in_ansys_workbench_tutorialqrl6c.pdfIn PDF document text
    • https://xibijogoxedugo.weebly.com/uploads/1/3/4/6/134662411/6943838.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/pevuwarobuvowa/82071845458.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/reradorixo.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/3654264432.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/jio_tune_sms_format.pdfIn PDF document text
    • http://werapitagu.rf.gd/13041258637.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/muradifege.pdfIn PDF document text
    • http://jodamedorofile.epizy.com/versi_android_11._0.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/biriyani_video_songs.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 5660 bytes
SHA-256: 1a887acd758feb954665eb5817f590fe72a2e5b55982184307c884b7ab789fcf
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 10996 bytes
SHA-256: bddb382ec01114a12d1cddf0d6d173d9f30e4223b6f20abd96313d3c459f4591

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