Malicious PDF — malware analysis report

Static analysis result for SHA-256 0815f6a388ff2133…

MALICIOUS

PDF

90.5 KB Created: 2021-04-02 08:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f6858d705bee51e5b709f8e23967ff3 SHA-1: 16d3cc34adc1d340b76f4f33ad531c671b17efa7 SHA-256: 0815f6a388ff213350b2a40913ee9a7614fd03ed3badfc013fde453a237581aa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://xezojetit.ru/strik. This suggests the document's purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=ti+nspire+cx+cas+spiele+super+mario PDF link annotation
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/fagisovikos_vubixuwa.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/be46d530.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/virus_meets_granny_shawl_tutorial.pdfIn PDF document text
    • https://pepesavujol.weebly.com/uploads/1/3/1/0/131071240/4211580.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/ggjhagc/fovazesamuzarodetoragotaf.pdfIn PDF document text
    • https://nivuzodix.weebly.com/uploads/1/3/1/4/131410872/5951204.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/590858.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bx31hfP/24535251601.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/volofebozigevig.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/berio_sequenza_flute.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/boxojutitagojid_pawopejom.pdfIn PDF document text
    • https://visameme.weebly.com/uploads/1/3/1/6/131636817/juzafudevosideteke.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/how_to_answer_text_dependent_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/jbCejbE/red_rose_tea_bags_breaking_open.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/TpQtjeH/piano_chords_songs_numbers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_7dfc2ccaccb24ec794ce77ad7eb47946.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_3487b4c44d6e493490ea57062251a343.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_10866003e6874ead8e371edf729dbca9.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_3f068a7e53d8479789beec6560a194dc.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_330f9a323f224f2fac11fb9c5ca0acd9.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_c4cd3ccd7ac34394a3c66d992d034657.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_33fd44b7d8a64db2b9845b138da4db20.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ad64ec3bc9f64f8ca0446b508fc4f0c9.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_2f59789e2d534403b419f33aa12942b8.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
    • 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_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 5096 bytes
SHA-256: 8fb8aaa523b5e911ed6dca86d23ae83f479c66e0ef14cfd834f4b369c2087c31
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 11668 bytes
SHA-256: a93ce83b46eaba04e1ff131487a66f41bb29cc9e266f71d8aa9070ef5ea054b2
font_02_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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