Malicious PDF — malware analysis report

Static analysis result for SHA-256 5191c8e265307704…

MALICIOUS

PDF

181.9 KB Created: 2021-03-28 02:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a61716d7c19b73d2d8b1f7a906ab3b2 SHA-1: 845c5f075bc006b62901a6f638d39f3042e6aefc SHA-256: 5191c8e265307704ccf39017008d14ceea56d3341c3ff930720f0230c62b801b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=who+is+the+no+1+hero+in+one+punch+man PDF link annotation
    • https://cdn.sqhk.co/vavewiminiv/cOBqiaW/525028680.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/haghiep/89000067754.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/ibcmIoZ/hai_kya_bolti_tu_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/eShdIWu/83534188676.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/free_computer_basic_course_online.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/ijchhtR/first_aid_beauty_honeysuckle_reviews.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/fosipukemeguvep.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/KUhbsge/what3words_never_get_lost_again.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/28082124395.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/498731.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/dakosenufi.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/lhbgeje/ruponekume.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/jhihrja/vamuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_1422c9b7840346468b84b29fd9542e55.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d2e4e4a84fa4445bb379c3bb6c704102.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_5d97c23beebb406a9001c855de132929.pdf?index=trueIn PDF document text
    • https://a93a1e1b-27ef-4877-b86e-8f07cc2ab01d.filesusr.com/ugd/1fa6dd_8e2345f778bb4b3f93c8bf0cd128ca74.pdf?index=trueIn PDF document text
    • http://gefilodeza.myartsonline.com/calisthenics_meal_plan.pdfIn PDF document text
    • http://gubadif.myartsonline.com/art_history_volume_2_6th_edition.pdfIn PDF document text
    • http://vekabun.myartsonline.com/51573462004.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F234 52172 bytes
SHA-256: e342a8a7a4ad23b2bea10a1eebaa23c1e37388db0b4cde23fb7c479d7b054286
font_01_sfnt_off00028f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F16 5208 bytes
SHA-256: 9abf77d45f056e0519656f16d0a363e05aed514e1c99a0f9afeb069818ccaf0f
font_02_sfnt_off0002a0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0AF 12520 bytes
SHA-256: 2b0f07205239f91fcdfe022eaeb58792a225ac3d159085f2339550af7b3341ec

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