Malicious PDF — malware analysis report

Static analysis result for SHA-256 144df059392e0e06…

MALICIOUS

PDF

90.3 KB Created: 2021-04-10 06:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 56e611c126d0e4aa498cfc91171dc322 SHA-1: b86678c7a1e8acb1a91365aca23e1596c236c084 SHA-256: 144df059392e0e0600b57ecb8178e0009838d83e3166e5982e00390c3db7c454
186 Risk Score

Malware Insights

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

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 0.9992

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://gimoguvi.ru/strik?utm_term=how+to+become+a+millionaire+through+internet PDF link annotation
    • https://cdn.sqhk.co/xinefegepe/jgZgfhh/zanaperajagukenoban.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/dhiaxgh/mofuj.pdfIn PDF document text
    • http://wonder-ita.space/does_procreate_cost_money_on_ipad_air2uu45.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/dqgcibb/jifaxusu.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/rC1jf7j/97230469058.pdfIn PDF document text
    • http://arfesopt.com/7321074919754emx.pdfIn PDF document text
    • http://mugedly.xyz/what_does_set_me_as_a_seal_upon_your_heart_meanyp5nr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6019bb8195edf.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/mefopiratesampwghg.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/vixonexu38eg.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/getjajc/56559569198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_604ae1ae03a35.pdfIn PDF document text
    • http://mscgis.net/altivar_930_manual_portugues5u9ls.pdfIn PDF document text
    • http://gouliwer.online/id_card_template_free_download_word_portraitnyf3g.pdfIn PDF document text
    • http://hookup754.fun/rupif1ap06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_88839c85148345e38cbb945a5d75ec94.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_21b3cc3cdcf749799ae77cfcadcaaa1d.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_c47361a01a1046908a7db725b2c49994.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_1e409e9827a54b0c94a80768c00b1fcd.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_e4f2df7dd4f24895b0922024eace76b2.pdf?index=trueIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_804fd54e7d124e51b40c190753d435ea.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_02d215d1ab7f41a080c24fe44be3881a.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_09ccc6756aff4ece958e6faea73a4982.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_1d3f94af590d4269a4f4cd6233133620.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_2fbf3af0a046405492d6cf0fe78bee56.pdf?index=trueIn 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_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 5228 bytes
SHA-256: f42c719872a3e1a6b23244cf9a41c0b5180f4e5aa91c5a88dff4cf2356ee3bc9
font_01_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 11088 bytes
SHA-256: 224395ebfff22958f13434ae2add7be18812f6fe58fc881ba33d6e6ccac2a8c5