Malicious PDF — malware analysis report

Static analysis result for SHA-256 582ad9396fb94a09…

MALICIOUS

PDF

82.2 KB Created: 2021-04-05 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 09851362df9bdc03874dde7544740b3e SHA-1: 3affac076b9c0c9fdc1e9a3154ea43ad62f82458 SHA-256: 582ad9396fb94a091b8eab1e29bf3e628f59ee3f90f19cade6e5ff594392f79f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://druttle.ru/wix?keyword=chemistry+chemical+reactions+worksheet' is presented as a lure, disguised as a chemistry worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://druttle.ru/wix?keyword=chemistry+chemical+reactions+worksheet PDF link annotation
    • http://gezilobogobig.22web.org/photoshop_for_pc_apkpure.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
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_7ed2af25a08e4b58a3145c236a221800.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb571d69-964c-401d-8b65-db019f9011f4/romeo_and_juliet_act_2_scene_1-4_summary.pdfIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_dd07e37570614ac38ca6143c5659d598.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de0466e-b723-43cf-9839-4184a7c7f089/play_script_font_pairing.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_a34031639c4140a0940faee4b0811a21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ec7df6-e7b2-4c1a-a0a8-9128f10a0e3b/nikon_d40_tech_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6075bd6-9194-4664-a6dd-c439341ee38e/surah_mulk_english_transliteration.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/vifapopogizobovaxowe.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_10fefb6e2a7c4d0f9b155964ed03dbf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/jewezog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c158048b-f32f-4a65-95b3-1f2a93a9dfb7/96060126179.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/brachiocephalic_veins_are_formed_by.pdfIn PDF document text
    • http://vigejufad.rf.gd/arterial_blood_gas_sampling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf12034-cd1d-48fc-a83f-87f1de85a800/mimizozagewa.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_79a9c401ac07462fb3a34acc55127b8f.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_beac4f28f0704043a6210fc3ed1f532d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2aa8d4-5e4a-4a60-a5e8-065387bcf1f7/how_do_i_find_the_phone_number_for_my_verizon_jetpack.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/choricha_mamla_marathi_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/venixevegujawozudipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a517d0d5-15eb-48bc-bdfe-40f3fea3e0b9/sig_p229_9mm_barrel_in_40_slide.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_e4b8795254c34a3b81771bde280def83.pdf?index=trueIn PDF document text
    • http://vofejobuvokare.rf.gd/basic_geometric_optics.pdfIn PDF document text
    • http://xawexixiwa.rf.gd/cbse_10th_maths_book_download.pdfIn PDF document text
    • http://jelalesixavab.epizy.com/vekipipokiluxokeguga.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_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 5108 bytes
SHA-256: 255e3109ccca3bf2b277d4e4d179c156f00053bf50e988be352fb8be4852ddcc
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10600 bytes
SHA-256: 60d2d9ad97f47295d0b279ea73c76e763a64d8e85289f92b33fc80ac2945acc1
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176