Malicious PDF — malware analysis report

Static analysis result for SHA-256 715f7eecd2efbca1…

MALICIOUS

PDF

69.2 KB Created: 2020-12-15 09:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b55a52df96185100cb8d57d06e805d70 SHA-1: c950ab4fd397c833ca69e27c612cceb8f8ed5c71 SHA-256: 715f7eecd2efbca104287ffb98302dc1ee42ff1eee9f1ded3da06d2681a28869
186 Risk Score

Malware Insights

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

The PDF file 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 phishing campaign. The document body, though heavily obfuscated, references 'Starcraft 2 strategy guide', indicating a lure to disguise the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=starcraft+2+strategy+guide PDF link annotation
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/risagiv.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/de6a3131c.pdfIn PDF document text
    • https://metuzozimo.weebly.com/uploads/1/3/4/5/134589213/tipoweguzetifuxugo.pdfIn PDF document text
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/7437361.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/dijaniduxemepasoxa.pdfIn PDF document text
    • https://vitebikune.weebly.com/uploads/1/3/4/8/134895950/sazut_fesopil_jerij.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/ece6661d-61fa-47a5-81ca-59336feefd43/5830683285.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/free_coloring_sheets_of_butterflies.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58d04cd1e280355f3c276/t/5fcecf1710aae775715eb064/1607388952610/16353925665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302d5b2c-8e2f-4f3b-8246-032daad0ff6e/marlin_buscando_a_nemo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53b43f75b16643cbf878/1606374325610/vakujobasolanafasiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad80aee-0f9e-4b44-b81d-c46540d367b2/aruba_spanning_tree_best_practices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253b5b8e-b674-4501-9b98-9455103374ba/65615900280.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5492 bytes
SHA-256: 9e19cd115101e7412e9e269b3f27e1c5f287c43d3ce00e81922bf19ebf15fb81
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10076 bytes
SHA-256: 2db57b8524cf650fb7e07ada139c39dd72321e67fdd1b3c235a86bf11ac1516b

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