Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa371e004e9cc81…

MALICIOUS

PDF

140.8 KB Created: 2021-03-30 00:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e3e6d86c7b8c6e971f51d05eb77b409 SHA-1: 9c1061b68daec23c1ea5c0b416fd39d6f6ea223c SHA-256: 5fa371e004e9cc81b9334447dd902f968c57d564afd5daa9e744d36c5ae06e08
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or SEO spam tactic, with a primary URL related to 'chapter review substances mixtures and solubility answers'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to direct users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=chapter+review+substances+mixtures+and+solubility+answers
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/5625471.pdf
    • http://karnaval.host/mx_vs_atv_reflex_cheats_unlimited_money0mdfz.pdf
    • https://cdn.sqhk.co/tajelezoja/jhfgexe/domobopakagijokofe.pdf
    • http://brosbass.com/luwusomolaguvad10ii.pdf
    • http://italy-small.space/53015983590d14i4.pdf
    • https://cdn.sqhk.co/koxixoneto/heCheTZ/wokafefibegiwu.pdf
    • https://cdn.sqhk.co/vekasurox/V1zlhby/hydraulic_calculations_for_fire_sprinkler_systems.pdf
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/6e34b50c640d05a.pdf
    • http://lestyprin.online/41989473713ojlhb.pdf
    • http://citruss.space/xugumukigiduzola126x8.pdf
    • http://vpntop.info/tubugf3559.pdf
    • https://cdn.sqhk.co/malevevipali/gr0aEBI/international_mobile_recharge_philippines.pdf
    • http://hermidkovo.info/julenc1rnu.pdf
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/pawobuxotum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guvovigo/cybrary_free_cissp_study_guide.pdf
    • https://s3.amazonaws.com/tesotiwapax/dell_r730_data_sheet.pdf
    • https://s3.amazonaws.com/belopudevuzuza/canon_powershot_a560_sd_card_size.pdf
    • https://s3.amazonaws.com/zuguvoxoki/88129537821.pdf
    • https://s3.amazonaws.com/ladojenefe/kendo_ui_grid_column_template_number_format.pdf
    • https://s3.amazonaws.com/gurowozenupifi/15429361246.pdf
    • https://s3.amazonaws.com/ronenitevodo/vumopavulopeb.pdf
    • https://s3.amazonaws.com/ratixifo/73532799932.pdf
    • https://s3.amazonaws.com/jixeremipet/paxogudifokizexerofaz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d0da.bin
a81dcec93d799bf26f629f4c60ec3a7ddee8987a6fe959dee8879a559d4c567e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0DA 5680 bytes
font_01_sfnt_off0001e40f.bin
7093be4dcf3e68f0b8430f4be35c5e1980954fab677b1096d5d4802876179c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E40F 12248 bytes
font_02_sfnt_off00020dc4.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20DC4 16060 bytes

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