Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c967f4b4bbf32ce…

MALICIOUS

PDF

81.2 KB Created: 2021-04-08 10:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab4f045a17d887f5b5a9c0f848228d17 SHA-1: 723502dc548bcfcfec0a1c39cf9c2e7994b6b6c0 SHA-256: 5c967f4b4bbf32cea56154262714e91ac88aa20e2fb08c48bd3032b46960268b
186 Risk Score

Malware Insights

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

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 0.9994

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=adobe+photoshop+learning+videos+free+download PDF link annotation
    • https://gilaniluju.weebly.com/uploads/1/3/5/3/135386901/nubituki_sogoja.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/ghcGecy/my_crush_hits_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bfEhha6/7654161872.pdfIn PDF document text
    • https://vivusujode.weebly.com/uploads/1/3/2/6/132682813/1e47135c73.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/6277190.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/Jig5Vgf/gba_emulator_pokemon_roms.pdfIn PDF document text
    • https://golasirase.weebly.com/uploads/1/3/1/3/131384643/gomezipilojoz.pdfIn PDF document text
    • https://cdn.sqhk.co/ratugetaj/RBBGMvI/york_yt_chiller_engineering_guide.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/8b790a79-d6e3-4b4c-ab97-08679068ca6f/kokobezoxokada.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/kiragawanivuzugefur.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_d67578fb1aae48adb12b989898303315.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_bb09286d77b94b85bc54f1edbf5ec99d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a34195-7e77-47e1-a059-df6c36bb6cb1/rlc_circuit_lab_report_abstract.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_8ada3d401ce9430395774cdf7300ede4.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_0efb753126c4439088a4a6c109af75a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c1fa16-7f39-496d-b005-da690072fc77/stroller_for_chicco_keyfit_30_car_seat.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_9067f1ed3e914c91a7f0f1d0b327df14.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_b62df9455431452da0638bf3efff22c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/bovozagelemuniwonarinil.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/8841369906.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_ae9c9636a8074c87b1e1152f68b78251.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/did_katherine_pierce_really_love_stefan.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/12940336306.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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 5584 bytes
SHA-256: 7e75073bbe74714c92de2cab2579951cc32bb7e57a201703bb58885f0a0ce962
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 10860 bytes
SHA-256: fc9f2a84891247a537d440b55729536ba83b021d8a83911ba0c3d174e0757be0