Malicious PDF — malware analysis report

Static analysis result for SHA-256 2875c3dd6ec77991…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a675b315c9ff51fa4b20e7242f568100 SHA-1: 780a80adaef204a54fea7df41c9847591c41dba1 SHA-256: 2875c3dd6ec77991a373eaa726d243e287600f3b0a263081cb0520ca88ab8c23
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, many of which point to disposable hosting. One prominent URL, https://pelibifir.ru/strik?utm_term=spiritual+lessons+from+the+life+of+david, is directly associated with the PDF's content and is likely the primary lure. The PDF structure and embedded links suggest a phishing or malware distribution attempt.

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://pelibifir.ru/strik?utm_term=spiritual+lessons+from+the+life+of+david
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5fed334a2bc48.pdf
    • http://xipodijajul.sportsontheweb.net/bbc_learning_english_download.pdf
    • http://simopuvoramawu.mywebcommunity.org/veladaralaw.pdf
    • http://tokudujadi.medianewsonline.com/sufavuvodeze.pdf
    • https://cdn.sqhk.co/gebunemif/p5hbBYS/minecraft_zombie_apocalypse_map_1._12._2_download.pdf
    • http://domotoj.sportsontheweb.net/roles_and_responsibilities_of_clinical_pharmacist.pdf
    • https://cdn-cms.f-static.net/uploads/4377381/normal_60533413493ba.pdf
    • http://rubolanir.mypressonline.com/pan_card_online_print.pdf
    • http://toxusuzom.mypressonline.com/the_buganda_agreement_1900.pdf
    • https://cdn-cms.f-static.net/uploads/4416786/normal_6046162719dfa.pdf
    • https://cdn.sqhk.co/rojawamusula/pXhhidS/22465848057.pdf
    • https://cdn.sqhk.co/budafitanu/ie1hiX8/6831125094.pdf
    • https://static.s123-cdn-static.com/uploads/4413454/normal_60058c7dbe8f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/83860580-35f5-4041-a26c-c884c2cec22d/what_is_brominated_vegetable_oil_made_out_of.pdf
    • http://wamunezufim.rf.gd/gawerevo.pdf
    • http://resilasijajatil.myartsonline.com/80728976020.pdf
    • https://uploads.strikinglycdn.com/files/744b355a-3b2c-4f92-aedc-ceca54c436b9/junepapugimawibuzisitosi.pdf
    • http://zibozepor.rf.gd/kiruzafe.pdf
    • http://gikisomu.epizy.com/dudaxugukutivatufesotuwi.pdf
    • http://xutenasejubibe.atwebpages.com/simon_ielts_speaking.pdf
    • http://zenejifawulo.epizy.com/munadupujix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e3.bin
5a19c3845a3e13ac3383e06b54316e75892408329257cb5baed2f2c173279932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 5324 bytes
font_01_sfnt_off0000f8cf.bin
ebb37f20e7f9e9ddb9478f8efb0e7e45e90966ce55d6f20ad788df359f68a9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10460 bytes
font_02_sfnt_off00011c6a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 4324 bytes

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