Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6bac2482a548a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 23:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8f1b424c66519b94cbcfbef4ac4480a SHA-1: 0acbc26416369d8513f8ba31e0ab67907cd91969 SHA-256: 8fc6bac2482a548a4d7a0c0b6fc75b43598beaa3f1974c8b2505dcec78dae267
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting and UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links point towards a phishing lure for a bursary, likely leading to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=colchester+sixth+form+bursary PDF link annotation
    • https://cdn.sqhk.co/vesagivara/jdhhhbL/58567844181.pdfIn PDF document text
    • http://instapriz24.online/fenirifot9mak.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/xepizetl3j.pdfIn PDF document text
    • http://werenntaq.online/boy_scouts_store_oakland_njwu106.pdfIn PDF document text
    • http://thailandlove.site/timesotezomuzulaputuzu0skr7.pdfIn PDF document text
    • http://j3vnci4.xyz/the_julian_chapter_a_wonder_storyq6kdj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5ff7b19db24a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_60337d7e17d00.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/OG5jjQs/super_chef_cooking_game_restaurant_street_food.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5ff49738b419a.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/MBjjgiX/connecticut_play_4_daily_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/fggghYY/metta_world_peace_jersey_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd27b4db0c2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxenipup/sabusosixunexuxema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1331ef-ee23-45de-91b0-fc3ce5c011a2/jebirikariputipuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/nisesofixudanak.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_285654eb2c0e420db39314e9c6506e0f.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b03f780f84674874ab7e7ed4dcf51ae2.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_a6f9dbfa39f84b429cb5515a85ee43c9.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_c600a89fa91146e1b1a06e31dbee0c67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f237748-e6c7-445a-9db3-a1123647a3ee/26659925552.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5228 bytes
SHA-256: ee6130a66137273f99493d703a2bc777a2b0b2c4ed05b080dc640d718517ea5c
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 12004 bytes
SHA-256: a860462d92c37a4d738359e855a7ac362354c7fd68f1b6845debe8c8e719556a
font_02_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176