Malicious PDF — malware analysis report

Static analysis result for SHA-256 a820196c410b077c…

MALICIOUS

PDF

79.8 KB Created: 2020-11-10 17:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e74fcadd43d3f98678d991dba43c3456 SHA-1: 0bd37f96289538289f9a38f76da74229747522fe SHA-256: a820196c410b077c743fe4aa19893638599f81c2088e4e791bb16608a59e7443
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm. The primary URL, 'https://traffking.ru/123?keyword=students++or+students+meaning', is likely used for SEO manipulation or to redirect users to further malicious content. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or spamming campaign.

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://traffking.ru/123?keyword=students++or+students+meaning PDF link annotation
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/e3721438d84b025.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/pokutojol_debuj_paruliguv_nigapa.pdfIn PDF document text
    • https://wezukanedipewor.weebly.com/uploads/1/3/4/6/134602888/kalotatojiwe_nonetu_bojowatiwisinep.pdfIn PDF document text
    • https://xolisibi.weebly.com/uploads/1/3/4/4/134462635/zovagojixomaxap_salopezolas.pdfIn PDF document text
    • https://tuzatorigipixaz.weebly.com/uploads/1/3/4/3/134321964/fotomav.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/miwidozozavi-dawenituri-gubiwizisupi-xarikepi.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/b86953de3e22c.pdfIn PDF document text
    • https://mewixaduzikizom.weebly.com/uploads/1/3/4/5/134594829/3787433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/afcat_2017_syllabus_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/44682865077.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/level_20_rogue_poison_quest.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 5216 bytes
SHA-256: 3f320a73f6dba00fad961aad0fb42d54056cc2b85e472519b5db0bf4de55f81a
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 10632 bytes
SHA-256: ef4b9e36dcfb27c46ecc482c840a12e323576430c4c8e9901052a4f40c401905

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