Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e94c86445d6d602…

MALICIOUS

PDF

115.4 KB Created: 2021-06-03 00:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 97dcd07554c59878b6d865ca05425619 SHA-1: 621d99a724945c2ffd6c6dccf56e322e0405d3bb SHA-256: 3e94c86445d6d602bf7fd2c04812246b6ae141956eda7c2ecec91c221889a8e0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, suggests a lure related to IELTS preparation materials. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing document or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=makkar+ielts+writing+task+1+pdf+2021+free+download PDF link annotation
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/dogese_wigusokikexe_walogubos_kuwanepovalol.pdfIn PDF document text
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/javiwin.pdfIn PDF document text
    • https://rigozanukamesok.weebly.com/uploads/1/3/4/5/134508669/seguvexuke.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/gateroluxifif.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/9587210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff54a97b-ba94-4af9-b35f-8c21112ddeba/38719070032.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144454014/dogoxevezomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aba4d8b-0690-4871-97f5-26cf363b2356/what_does_the_word_horizontal_force_mean.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/98380094218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fb26eb-d513-4429-a65b-7e64c7e4b874/how_to_seal_climbing_rope_ends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8884409-0e51-472a-95a0-f1ff3c4e6cbc/jeep_cherokee_transmission_rebuild_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84cc3c2-7ed2-47cc-b1d3-507308dac915/63497726538.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/74404928780.pdfIn PDF document text
    • http://zudilazo.pbworks.com/w/file/fetch/144503868/cambiar_creencias_limitantes.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/23679664644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c67ec7-843e-421d-b934-2d278ca3f5a1/simplicity_tractor_parts_near_me.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144517485/how_to_use_one_touch_ultra_2_glucose_meter.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144440916/ganawuxudupaweruje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4146d7-b99e-43f9-ad75-b8f9f2db6387/ridofob.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/dozazikatijaxaxola.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DC 5696 bytes
SHA-256: 5f051cce61c5785259b7b263a2232885ada6435d17b61af3e35d303628eadb98
font_01_sfnt_off0001777a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777A 4440 bytes
SHA-256: b57f53c110a6af6647ed8b6783812de649cdc515eccc74b633a0a780981d5a98
font_02_sfnt_off00018363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18363 11060 bytes
SHA-256: c172ff4b801cdd42c7ab1f6157c17df482adcc5179ca8b0953519ebd2bd2536d
font_03_sfnt_off0001a980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A980 16164 bytes
SHA-256: 967d89e51290aceb8fea09c2f9e0c707663cecf1a9b826b2128538f448fdbc28

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