Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab22495e85d6c445…

MALICIOUS

PDF

109.1 KB Created: 2021-04-04 17:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e4b25e301c3d2c1d2236c55fea43467a SHA-1: d215add8bbe67c0effc97eb813a3de6f4910e439 SHA-256: ab22495e85d6c4451897db8d4c4ea50e63d46c62831a577c09b4179ba19a1c04
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to a "Tera gear guide 2020", likely a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/wix?keyword=tera+gear+guide+2020 PDF link annotation
    • https://lorazitir.weebly.com/uploads/1/3/4/3/134393639/4103456.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/deb030.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/tuxipurekenenumatus.pdfIn PDF document text
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/550d7.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/f463758bd5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_5fdb109e7e2c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5fc87c0fde8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fe7ecf876d15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5ff34d7a34e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_605da5a73973a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_60278fa16671e.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/redomojub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5ffdb0efb6575.pdfIn PDF document text
    • https://nozuresosobud.weebly.com/uploads/1/3/4/7/134758814/kagufijoju.pdfIn PDF document text
    • https://fumadutukit.weebly.com/uploads/1/3/1/4/131437402/tosoje_wexulada_wamajuluna.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/40e45e8a-35c6-4fa6-83ac-f403c582ddb0/vukipojulewabolovowis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd42bd9-8e8f-4f16-abf6-918b9ed4843a/gexogatenuxafamasejepa.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/91487034454.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/polepagis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2f64bb-02fd-4128-a0a2-25a248b7e13c/81227907164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7c5479-1c11-43db-a5c3-788541c738f9/kejevitizakotilaxon.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/50302657917.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/1193467057.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_off00016cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF4 5008 bytes
SHA-256: c3c09d0cd00e54c0f7cdf39d8ce71771838dd5463386b1c562bfd4df505e876b
font_01_sfnt_off00017e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E06 12412 bytes
SHA-256: 6aacb3b70fca0f40a5f80b1c3668782d33514e5055f0390eab0296d401474600