Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1db485b420fbe00…

MALICIOUS

PDF

79.0 KB Created: 2021-03-13 17:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac6e40def3090c3ec3672c7fd445b8a SHA-1: 2c698b33a9c3b3fec896cf508fbe4d59680d8902 SHA-256: a1db485b420fbe001832e999edcb6c9197be2a014a5bbbeb7fe63726fbc05caa
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, forming a link farm, with the primary malicious URL being https://midufefew.ru/wix?keyword=water+pennywort+plant. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities and redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=water+pennywort+plant
    • http://segaruzobuguses.scienceontheweb.net/machine-learning_models_for_predicting_drug_approvals_and_clinical-phase_transitions.pdf
    • https://cdn.sqhk.co/pojimisuso/hchgWig/tabletopia_games_review.pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/3b4a666.pdf
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/xukarebevafumol.pdf
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/3323380.pdf
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/betavod_gijomujomemab.pdf
    • https://cdn.sqhk.co/tinipuded/nygdpgh/zarukixufizosiziwamog.pdf
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/wikunevizuputi.pdf
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/jesewi.pdf
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/mogejoxug_mikupijupoxivi_zadifumoxitu.pdf
    • http://zilixijabukepul.iblogger.org/lipirafexu.pdf
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/8587287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/696d928e-b265-4208-babf-7b63796aa116/how_much_do_car_technicians_make.pdf
    • https://uploads.strikinglycdn.com/files/a6ac23c7-a326-4e96-87a7-33cfa8b59d2d/citizen_eco_drive_gn-4w-s_price_in_india.pdf
    • http://kilarosine.atwebpages.com/kuzidopezinojepugeri.pdf
    • https://uploads.strikinglycdn.com/files/eeb02136-a701-40a7-9857-b81723c61500/91985595645.pdf
    • https://uploads.strikinglycdn.com/files/4add9ec6-cad6-4623-b096-8f0c4391f88b/rheem_tankless_water_heater_start_up.pdf
    • https://uploads.strikinglycdn.com/files/0d6a53f0-8a69-4b80-b3d8-00aafbed6737/duralast_900_amp_jump_starter_charger.pdf
    • http://pajamubo.rf.gd/nobunozufenapi.pdf
    • http://keputeka.epizy.com/zixupaluvupepamosot.pdf
    • http://jawuwibunoropo.atwebpages.com/cours_sur_la_segmentation_marketing.pdf
    • http://woxutonugosafer.epizy.com/jedijinoxifijaxazajam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76b.bin
7fc5c9190beaf67d14d486ea1a51c435107759f1b45c52abc2821ac7ac8bdf2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 4844 bytes
font_01_sfnt_off00010813.bin
77d5d84fe951347129c2b6f7ce1ee2028f5e48f90333cba5321742337ccaa279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11332 bytes

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