Malicious PDF — malware analysis report

Static analysis result for SHA-256 649630dbe4110f9a…

MALICIOUS

PDF

82.4 KB Created: 2020-11-21 16:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 357a27586855cad4e7c712001117f92f SHA-1: 2e0ffb44ff02e255edd90071fd5b3f16c1b4a764 SHA-256: 649630dbe4110f9aa6d4599d1da2db4da777dabbaa7b90d379fdc0dc234a9d76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=dk+atlas+of+world+history+pdf PDF link annotation
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/284ec097.pdfIn PDF document text
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/bumuxeludezajuse.pdfIn PDF document text
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/kedudilibi_fisigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_5faaca1909eeb.pdfIn PDF document text
    • https://lokurosafo.weebly.com/uploads/1/3/4/4/134479987/5759339.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/kifun-nulotaliz-rebexi-janadidon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5fa18bfbddde6.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/rizijubovapuk/62965924011.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/3994581030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b715dac-186e-4fdc-8ebd-a01cc8d74092/sistema_locomotor_del_cuerpo_humano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029e4a96-8f59-4d12-89be-9028e60f4af7/32781337568.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/18631515942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b44c61-1b87-4f15-9899-e5b756b2941d/natek.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000119ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119AD 20988 bytes
SHA-256: bd3ec35799b77f83c03cebb91902bffdb9bf534a68b65c1182f7860aa6b80e14
font_00_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 5384 bytes
SHA-256: 76edff2c53a992c7d276426b81a8b839856e2c14ba6fc6725e0bce483a6a4eb1
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10688 bytes
SHA-256: 1236ec1834149681a41cd3c6541d79d10d50d28240c864e61b6e7d169e6cb1c5

Open this report in the interactive analyzer, or submit your own file for analysis.