Malicious PDF — malware analysis report

Static analysis result for SHA-256 a208ed70306f0649…

MALICIOUS

PDF

47.9 KB Created: 2020-11-07 13:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0775335199bfeac9582a5e308063f6e SHA-1: 6073d2c7a690cc20ae411f39b591268b9102aeaf SHA-256: a208ed70306f0649378ac26310daa7f3a6d55ba24bfe274068c0e4c2d7e6ee3c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous links to external sites, including one with a suspicious query parameter, supports this assessment. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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?keyword=schwinn+a10+exercise+bike+manual
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f870282c61a3.pdf
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/c6d96cee7.pdf
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9b5439d968e.pdf
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5f9fc9c8bed4b.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f89382424a15.pdf
    • https://busigejog.weebly.com/uploads/1/3/4/0/134017549/vogakefafuvujewusok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef18aa39-17a6-427e-bb74-98889da5e199/office_2007_full_espaol_activador.pdf
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdf
    • https://uploads.strikinglycdn.com/files/8e247f28-d52d-4225-acef-e8271eb44cde/88267039917.pdf
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdf
    • https://fepefik.files.wordpress.com/2020/11/48421735761.pdf
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdf
    • https://s3.amazonaws.com/sugaguxagu/dukizomuzat.pdf
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdf
    • https://uploads.strikinglycdn.com/files/820d5f11-2e90-4949-94aa-57b7505cf893/35722358819.pdf
    • https://s3.amazonaws.com/likadojivivofu/foredom_flex_shaft_jewelry_kit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007caa.bin
b96d9f1e01f77d7f880910396758d87d02d266b887dde0628fea29e31217f07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAA 5700 bytes
font_01_sfnt_off00009005.bin
210b94630de64847a196a9759280c0823136c91495d27902d6c9284d4b286a44
pdf-font-stream PDF embedded font (sfnt) at offset 0x9005 10484 bytes