Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04f455ac2ac0402…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 14:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41ede6adaf3843777f32c28657ac8e37 SHA-1: 273fcbf5781827ee1080894438abd55bd69e653f SHA-256: f04f455ac2ac0402d5633280cded8451cfb81910ac8e538ee06e7372f0a953c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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/123?utm_term=runner+alto%2527+s+odyssey+apk PDF link annotation
    • https://cdn.sqhk.co/rovujesox/ia33lEo/ziwuxavew.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/idhjicg/car_racing_halo.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/3060712.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/4309031.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/domoferabab.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/wiwamativiwu.pdfIn PDF document text
    • http://numulul.mygamesonline.org/master_forge_grill_model_l3218.pdfIn PDF document text
    • https://logugutixolug.weebly.com/uploads/1/3/5/3/135393325/rakejinalopada_kunim_rubuzeruxetefe.pdfIn PDF document text
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/5436567.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/tazisavitapasib_rikudom_senuzumerolup.pdfIn PDF document text
    • https://xajogizikotepi.weebly.com/uploads/1/3/1/4/131437636/sozugurusanelad.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/us_electrical_wire_color_code_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/ePyyi0X/wowexoguvukevegepesu.pdfIn PDF document text
    • http://sobokapim.mypressonline.com/tryst_with_destiny_full_speech.pdfIn PDF document text
    • http://lowazaz.22web.org/89334159040.pdfIn PDF document text
    • https://menuvinowit.weebly.com/uploads/1/3/5/3/135320060/6830181.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/Bggiar9/twitter_video_downloader_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/czTlwZn/89904085601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/678db15c-2f17-4061-90dd-949dab83e654/33520232156.pdfIn PDF document text
    • http://pijutisiguzog.rf.gd/70923149701.pdfIn PDF document text
    • http://xuvelenidoxi.rf.gd/83558287193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf9a758-ea16-45fb-82da-53cb3816358d/81860082408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca20dc0-cc83-450c-8079-0ee6a2857a82/14508393460.pdfIn PDF document text
    • http://dopatujijidami.epizy.com/plasticizers_market_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03fcbcba-13b1-4523-9add-3f4fc0692c96/wuletafuvumonetumifege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0e412e-8aff-4dea-8256-47700555b721/computer_maintenance_and_troubleshooting.pdfIn PDF document text
    • http://napezidemilolez.epizy.com/composition_and_functions_of_blood_answer_key.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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5160 bytes
SHA-256: e9fcbccac628b4b5df692a5054c2f6c63c470a1f2b6e35fec315926a555ecd90
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 11148 bytes
SHA-256: 13d0bb5eef86b1ec5ff6d614ae83a4e060101d5c12fe6d8fdaf7d056128997c9