Malicious PDF — malware analysis report

Static analysis result for SHA-256 643773c25ba28993…

MALICIOUS

PDF

82.0 KB Created: 2021-03-30 21:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cde181161862c6637b3a35601a2906d7 SHA-1: 5b6ee340860dc25d7f63f1f92073ba02754a2c92 SHA-256: 643773c25ba289939e5fc317663d8d7a52c79671cbcfb3d1723c831a82fae730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=can+you+build+strength+without+weights PDF link annotation
    • http://gojawufeki.getenjoyment.net/18020530239.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/Qjdndha/blaze_and_the_monster_machines_cake_toppers.pdfIn PDF document text
    • http://tifizutolakefu.22web.org/pujeserama.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/gastroesophageal_reflux_disease_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/hjhaagf/verizon_my_fios_gateway.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/gDgdFgd/mi_x_launcher_pro_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/nazogadupukizukewabinuf.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/oracle_weblogic_server_12c_download_for_linux_64_bit.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_21144a3c85a641f585dd41dd27e4ea05.pdf?index=trueIn PDF document text
    • http://zikoliduxa.atwebpages.com/fisher_scientific_isotemp_oven_error_codes.pdfIn PDF document text
    • http://nepupiborama.rf.gd/amplitude_modulation_basics.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_289d1002d29441e7a65c337fdbdf143f.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_fbf6db583b8947b68e0f68b50cb53033.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/graco_4ever_car_seat_forward_facing_installation.pdfIn PDF document text
    • http://tesekinapoden.epizy.com/94603429895.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/35275903084.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/wakedavojiguriwim.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_90a9849145d04511a7a21ad443d475ec.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_f4c9342a36dd45b2b42bc8fd7b6e7443.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_cf47bb39dca6468ca0e64f24ba0b0db6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/60441388168.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 5324 bytes
SHA-256: c151ba6a1f00429101654c814b6957f7b161bb5957048a4add405ae956a471a8
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10740 bytes
SHA-256: a61699e1b034d662fbf1e84470d82ccb9d7517dcc105e799cdd3e15b33f94ada

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