Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a53a18689def9ba…

MALICIOUS

PDF

82.4 KB Created: 2021-04-04 02:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f41e43b298bc7aab1480d6d34f03c828 SHA-1: 437c843906acd205596427f2efbe8980078f626e SHA-256: 8a53a18689def9ba4f288fe20caac4739b2b6a5a2a0e1a1874ecbe204be72101
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://resalured.ru/strik?utm_term=love+story+2+film+2020' is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/strik?utm_term=love+story+2+film+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501503/normal_5fdac1a092913.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/9e273.pdfIn PDF document text
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/6671715.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/rikav.pdfIn PDF document text
    • http://gnatural.space/what_is_function_of_metabolismro89j.pdfIn PDF document text
    • http://creamwalls.space/ircc_find_forms_and_guides6t4el.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/ratigigodoxera8h1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_6049cc22cc149.pdfIn PDF document text
    • http://faceit.su/45575638352ztyu.pdfIn PDF document text
    • http://gufutaca1.xyz/80_day_obsession_challenge_packh3ad7.pdfIn PDF document text
    • https://fazipebafutemi.weebly.com/uploads/1/3/1/8/131857540/dexefovifu_jaxodarupitowe_safuvebine.pdfIn PDF document text
    • http://podarokinsta.site/can_i_still_download_sketchup_for_freejtwe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fdc6fb86d141.pdfIn PDF document text
    • http://ledimpress.biz/the_cultured_pearl_opentable9jbfr.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/lexuwigolulevigonepu.pdfIn PDF document text
    • http://zarabotok.space/greatest_hits_radio_coverage6iro3.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/1961775.pdfIn PDF document text
    • http://semengergel.ru/cfa_level_1_books30ikv.pdfIn PDF document text
    • https://kugijibogizupe.weebly.com/uploads/1/3/6/0/136055246/muxilidunixusi.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/4a5f1efbeabc.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/samsung_ln32b360c5d_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fcd73a6d381a.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
    • http://xakazasaravi.onlinewebshop.net/bureaucracy_theory_by_max_weber.pdfIn PDF document text
    • http://gafodix.myartsonline.com/sogibanal.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_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 4764 bytes
SHA-256: 2c1b02728bfaa5badd84a15c5286e4e59c976dfbcfe451f6fc808cba844b70a8
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 11584 bytes
SHA-256: 059ca2d0b409ff2254943e826b39a0e98ea7d6bb7ddd6cdec2c8f9fe7c57d6cf
font_02_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361