Malicious PDF — malware analysis report

Static analysis result for SHA-256 834dc5a6ffdf712a…

MALICIOUS

PDF

75.6 KB Created: 2021-04-17 01:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 857c1ee258b88d27bc1d0c91ba91d51a SHA-1: bfc29a3df372860b47b8da0e6e5443ceee759323 SHA-256: 834dc5a6ffdf712a5a2f423e41dadd4366fca2ee9da20a90aba45bbc92e9a630
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirect to malicious infrastructure, such as the URL 'https://yafferge.ru/strik?utm_term=myers+briggs+compatibility+test+free'. The document's content, despite being heavily obfuscated, suggests a lure related to a 'Myers Briggs compatibility test free'. The presence of numerous links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=myers+briggs+compatibility+test+free In PDF document text
    • https://cdn.sqhk.co/fokofike/UBv4nhd/vazizawanorituwoweto.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/cjaStUC/kazowubuzugewuxalar.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/4jdiidz/trailer_hitch_ball_mount_harbor_freight.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/87034223825.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/tigigi.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/libro_completo_colorin_colorado_este_cuento_aun_no_ha_acabado.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/3071491642.pdfIn PDF document text
    • http://reduslim-shop.website/what_happens_in_the_original_hansel_and_gretel_story27sqe.pdfIn PDF document text
    • http://itactical.xyz/9138502521714e20.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/3tjilNr/hangouts_video_call_no_sound.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_c096ac95e1cb49c98533b6d1cb4562c5.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/3969767868.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/honda_express_nc50_for_sale_uk.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_7082a541af73494e92ec013aaf2c9ad3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/49582084398.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_8eafef4c26494a21991b7db625bd9160.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_693fd3e4189943f48e36c8a5a399d65d.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_78e3558f561b4365b58a41063071ef23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/how_to_tell_when_a_car_seat_is_expired.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/59057653401.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/optavia_maintenance_guide.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_a1253238ba2f4b7daec00d275edbb97d.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_340408dca3f840459707024b3ff8a0d6.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_ffeb41e334d3492f8dec29e60ee34104.pdf?index=trueIn 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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5580 bytes
SHA-256: ca1bbfb1cc83d1049cf5791ab6cf309d8ce9a95fc0bbe5c50f7feb6d41bcdccb
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10784 bytes
SHA-256: 1a37db5f7a03c75ea19d4c0b8acf53445242b70a68dec035e431a1723ee8f482

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