Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b43f0edfa6acc7e…

MALICIOUS

PDF

69.0 KB Created: 2021-01-23 19:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6fa40b51e466478b8f6ea13d960c90f SHA-1: 1a690b5a18d45395e20abae31f6ab5bdd514ac8a SHA-256: 9b43f0edfa6acc7e63ca83755052fe50d13c20f741a1a340ae8a70d195fcc682
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the sheer volume of external links points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/123?utm_term=dr+sebi+recipes+pdf PDF link annotation
    • https://cdn.sqhk.co/vimexuda/1gcijij/lomuz.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/hLqOJif/unscramble_words_crossword.pdfIn PDF document text
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/456c32c.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/R2LHjfg/22358621723.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/c3TiVkQ/parler_users_vs_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jgchfnw/cyclebar_garden_city_ny.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/1752467.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/dKgi1TX/77374448416.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/ijZiggg/72138621721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fc9ae367b64b.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/hdpEjia/43323011741.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ZggY6if/dragon_world_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/TDfjsGA/10811608929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fdbc35785135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff78359d8a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_600b799e2a146.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/parudaviwil.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/6901087.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/zifozujiwi/acmarket_apk_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/wiwamijexedifaxugomegi.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/aarum_kanathe_yaarodum_sollathe_song.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 5044 bytes
SHA-256: 758b8a612521aafed5325729e0335f0da1c49369f476e1fce876737252eb308f
font_01_sfnt_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10212 bytes
SHA-256: 24a990883eb5b010d218943b3e2a8310cf347712b45de590d838aa41111b5c7c