Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01fa63c2be2f727…

MALICIOUS

PDF

85.5 KB Created: 2021-06-02 12:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b9882b2d8fc54fc570802261b5d99f23 SHA-1: dea442554124bb99c9f16d6062b35a00774d4649 SHA-256: b01fa63c2be2f72783ab8d0591f2159162592194b156a8600d3f142d0a46dfdc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/123?utm_term=epistar+3528+smd+led+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60342600a91ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_606e937ca91e6.pdfIn PDF document text
    • https://kesozawowoguza.weebly.com/uploads/1/3/5/3/135310598/xomojutewetixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fee456ed3e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ffe43206bf4f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367631/normal_60b6ca1d4ea04.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/2531438.pdfIn PDF document text
    • https://zezefikopupom.weebly.com/uploads/1/3/4/6/134686460/kadukudewudelime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144502077/where_can_i_watch_twilight_for_free_quora.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144472533/tinubutunabefikivudogibaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa64b104-d995-4d3e-9894-7b2726947196/medication_math_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f6b1e6-637c-4703-997a-dc9b0deb54b9/96952425353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639348d0-3cb7-464a-803a-1356d5c418e0/voderepifetelolusadifa.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144423285/tolegogamumizewajiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8225cb29-f342-47a6-bb2d-4bc232079782/9251636129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a2ec85-d5fc-43fc-a463-66b09aa35bf0/gogesobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298e40bf-af74-4a45-9b84-43009e6d5bc3/intermittent_fasting_meal_plan_indian.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/ver_tres_veces_tu_3msc_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0eb1f3-1c91-4f26-8896-934ab8708893/can_you_be_a_bodybuilder_on_a_vegetarian_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0441a4a-8f5b-4add-880a-c0a62a0cfdd1/mamebimesevesamox.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
    • 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_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 5772 bytes
SHA-256: be5703806fcbb54ca3a89ef59ce9654ce6494b9051227068219ea2f1873d94d5
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 12656 bytes
SHA-256: 37ac8c3426f3349ec394cbdc7e700d11eab2397a9829cc0e3c6c37dc2ffcf878
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 16308 bytes
SHA-256: d6458a1cb35db88dfe787732a628bc66baa12edf791e99a69e1353f83a0f8a8c