Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3355d80efd1450…

MALICIOUS

PDF

89.0 KB Created: 2021-04-05 07:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23b92c564057eade511f565969eb0186 SHA-1: 6c5db860c4465f55909ac8a41830a5a6825a3673 SHA-256: dc3355d80efd14506abc0437f38a1a844a4cb02874a5f6b2b2bd4bac00d8f20d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially malicious download sites, such as 'http://babubusawase.22web.org/3ds_max_2017_trial.pdf'. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=english+moral+stories+pdf+free+download PDF link annotation
    • http://babubusawase.22web.org/3ds_max_2017_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/hfSYZhH/62241294470.pdfIn PDF document text
    • https://xitujufos.weebly.com/uploads/1/3/1/4/131483255/5159b2807.pdfIn PDF document text
    • https://cdn.sqhk.co/nunepokuwe/C4wvqjg/catfish_cooley_wife_twitter.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/where_can_i_learn_sword_fighting.pdfIn PDF document text
    • http://neletaparufo.scienceontheweb.net/40787978568.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/tezewudanubilop_dejomedebozix_xuwevawurun_doruwutuvinog.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/jJoQUCb/nitro_rc_planes.pdfIn PDF document text
    • http://jodazok.22web.org/celcon_acetal_copolymer_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/ujgEb6P/fufazakamabetejejejes.pdfIn PDF document text
    • http://rumepado.mypressonline.com/fewaxutukimibavam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_21fc823b7ed04d5cbc069020d4afa67a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/abcd_2_movie_songs_naa_songs.pdfIn PDF document text
    • http://nadiripu.epizy.com/champions_league_2019_music_performance.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_5dbfd4f64a674f9787e8970416d5ef0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/77670195163.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_7ac9b7d6f03048c5bb70cacb6f1a2537.pdf?index=trueIn PDF document text
    • http://tuxefefili.epizy.com/77924713868.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_322aaae0b5804c68839945d0dfc5b177.pdf?index=trueIn PDF document text
    • http://kesugoda.rf.gd/60406784155.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_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 5504 bytes
SHA-256: 7cd28618d78c1fbc44066cdeef35f367e8848c4d6a1b63e831e346a5c832926c
font_01_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 10928 bytes
SHA-256: 79f0bff534fa3e43ce54ee6e03f2244d4bdb7221ae9fce1423c499b481c54c9d
font_02_sfnt_off00013f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F66 6464 bytes
SHA-256: 255d28ff4cf526faa29a9d00b48e4c06c3af27caed3800c41fbad43b0fa36bca

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