Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7a7f14331846be…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 01:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bc47707f1a4ed9bee0dc4a9730390f4 SHA-1: 5be51383ba3a4654b9ab77ceb2c0196b1f7fc056 SHA-256: 6a7a7f14331846be2cb1dabbc0a1bdcf0eb37a4bf8933b172212a7b9d6ab71f7
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 0.9997

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://resalured.ru/wix?keyword=applied+statistics+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376609/normal_5fee21b689b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5fdc52fc33c99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fd07924be71c.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/e14ba8d5-0a8d-4ef3-80b4-ea76d298b7fa/fixutowemupajegata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf1bf75-e90f-486c-a0cd-3aff4333ed31/gojolijex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2958e6-fdf0-4219-8172-cc5f6dbac33b/26711405624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7419bfd1-a065-4a24-bb28-404c3264f75f/xixoragib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8cd0820-649d-47d9-99ff-9eddc31bc8ef/xerox_workcentre_7845_price_in_india.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_fcd41ec18ea344ba93191f3f7742dc8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8dd8b4-7520-4a3f-b5bb-5559c37af3ca/55490329982.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_ac3e2c2fbb6144099460fbef95417ad6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51b2638-a358-4678-9a05-850925eb9896/39035031051.pdfIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_2a09b576693a4b908149cc6f55b9c140.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0bbbe1-0c9c-47bb-a46b-6dd389d2bebb/58974620217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4ec787-6d46-4f26-ac10-2b0dd1deefa2/18132542112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfe720a-48dc-4749-aa73-f4e52c12538d/todubuw.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_fe083fbebddb4fff9088189f276be976.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_95e1e3ae9a6e4778b5a72e194dae426b.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_c88e73c51b4f4260abaa4f15cb8c08b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b7e337-8f62-41f1-a24e-c0fc9452acea/lijasarosetu.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 5236 bytes
SHA-256: 5531b97e6b20dfabf091676c037f3bad309db1935904e580b3c262e9a187f9e7
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 14556 bytes
SHA-256: c85c64d0846f807acbe6b6822d08afb9bc8dc0ad8474378b820d8250642a10f4