Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f31901edf9365…

MALICIOUS

PDF

73.3 KB Created: 2021-05-15 01:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f1e2d6e50fbdf5aa858a7fa5eb88aa08 SHA-1: b65b0116e4db23cef439986e933c6d5e1830246d SHA-256: 0b1f31901edf9365a54fbba517eafde597ffe9fe4873c7f262e6697ce3467298
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary URL, 'https://xajibur.ru/strik?utm_term=fisher+price+2+in+1+deluxe+cradle+n+swing+reviews', suggests a phishing or malware distribution lure disguised as product reviews. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=fisher+price+2+in+1+deluxe+cradle+n+swing+reviews PDF link annotation
    • https://cdn.sqhk.co/gasowifozil/ZEvvwvZ/crowd_city_3d_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_605d445267132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5fe7927b74f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_602d945a3d780.pdfIn PDF document text
    • https://cdn.sqhk.co/neruxojus/7heghjg/garasoxoduwedazekuw.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/jdagejj/hill_racing_games_apk_download.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/65231193992.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/gRjjVzT/grass_cutting_robot_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601d9f6c1a0fe.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/zujuwemutezanitagivap.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/vewaromuxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_603be29dccce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_604e98fdccb88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5ff7c9cfa31e6.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/8278393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_606e379ace49c.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/80784243886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_606821b2cdb6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_f4810430d6544050bd3fe29df17becdd.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_1f228c0120bd4fdb95c125f27fd5c078.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_132e1da763694c0fbabffeb849c8c1ab.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_e06ad332a6ce463381c8d6c5176d0001.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_99c4d3672b834d65804020d0a0a40b36.pdf?index=trueIn PDF document text
    • http://gipebevu.atwebpages.com/murafamonev.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 5696 bytes
SHA-256: a2321e9a3288cde54c51d4af354bdf6b4bc8afa428c1a20e582cbb67f04e6ab7
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 10948 bytes
SHA-256: 804c9bbd41c0c224210bb24ae8a2a6f019340b977b1697848989a687a9785f45