Malicious PDF — malware analysis report

Static analysis result for SHA-256 071e518c4944c95f…

MALICIOUS

PDF

71.9 KB Created: 2021-03-17 23:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: af2ff13ac30d59cc2dd0fa0ae94e7cbb SHA-1: 57f796fcd2e52ff3505522100530fbdae5c3d1f9 SHA-256: 071e518c4944c95f49eb4e38e0a5856b276635967fe874f7df06316c36f3d202
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 0.9960

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://vilenefex.ru/wix?keyword=punctuating+appositives+worksheet PDF link annotation
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/df4bf0326b3b.pdfIn PDF document text
    • http://presente-top.store/65089679180mcpek.pdfIn PDF document text
    • http://topcreditmonitoring.info/olympus_om2n_repairn0nr5.pdfIn PDF document text
    • http://fb-pageunderreview.com/rutherford_scattering_lab_reportu7poo.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/lutisibobuxigepokif.pdfIn PDF document text
    • http://vengriya.space/komubapeweneporuketyqx37.pdfIn PDF document text
    • http://tertov.xyz/mikusovelebelusato2evjg.pdfIn PDF document text
    • http://revershjtb.site/85969912223k65gt.pdfIn PDF document text
    • http://navaram.online/933268588388zey5.pdfIn PDF document text
    • http://gayerkan.com/batulelus029wi.pdfIn PDF document text
    • http://italia-doc.fun/the_sixth_and_seventh_books_of_moses_reviewsaskx3.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/9297552.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/pazatuv/10229260444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885f7d61-bfc8-46e6-b518-8b910ddd9c45/37141628618.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/dezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f07b17-9967-4bef-9d92-00d640e1cf32/what_happens_at_the_end_of_the_sense_of_an_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/basudibevekowovogesirabu.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/le_barycentre_cours.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f3732496b2144daeaecd12a03d4be18f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd9d77a-c398-4d4f-982c-e2a57906d114/gonanasabanojekuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7ea9a0-2130-4f97-9428-581a5a09a7e3/15265021606.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_63c20ce17a1542a1b602b274e815262b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/507e99e6-a522-404a-a8a4-0326b66bee6b/how_to_draw_a_sunflower_step_by_step_with_pencil_easy.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_c3bec0021b2b4df8ad7b1dce8ea07c8a.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_bc6a8f971f4f4ea7b57f0db2527d7e3b.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_7c6098859e6144e3b74c79f5b6ac2906.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 5380 bytes
SHA-256: 308463fff0084ac12eb8f92e0ce6f2d7f18ce767697e3ccfccfe3244d22cc869
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10976 bytes
SHA-256: b6ce499577b491683343ee6607ede9ef16eaec6f41808d6a738a957187e23a41