Malicious PDF — malware analysis report

Static analysis result for SHA-256 151b97ee4baeecb2…

MALICIOUS

PDF

69.3 KB Created: 2021-03-30 04:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc72b4b26de59d631e6545a95746df47 SHA-1: 731f74f0151141cc6386c281cc333ab211e63b58 SHA-256: 151b97ee4baeecb230b1b835453d57d7bb2922b7f48659c92a5b03e17f66d79d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to making money online, which serves as a lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+make+money+by+teaching+online PDF link annotation
    • http://bluhgang.best/65190233964xua5k.pdfIn PDF document text
    • http://merishwheelrecords.com/what_are_the_5_love_languages_test4i3pd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fcf190edde47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_6037403731e04.pdfIn PDF document text
    • http://pestore.pro/tufowasoruvv9vo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_600a1fa454802.pdfIn PDF document text
    • http://baugroup.info/bellamy_brothers_full_album_freesgv6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fe6083c5dc03.pdfIn PDF document text
    • http://vinnipoh.fun/manosonoaocw0.pdfIn PDF document text
    • http://sfr-webmail.com/zalinuxilawafimizuj42syq.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/wukevirenesu/dell_latitude_e6530_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0337ddc-97e0-4737-bc6b-a17f73506f4a/how_much_can_a_2012_jeep_grand_cherokee_tow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e16765a-07b3-4a49-b8ef-b5cdcb610f53/tedupef.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_e1b5202e043044faa84c9cb5e6eafa10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/781f9b27-7fed-47ed-b8a4-16d246aca19c/saffire_pro_40_manual_espaol.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_32f81e7509cf4f16b6754fdb81f408f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/pozewuzit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae13aeb4-44c6-408c-9e78-7ce96c048e2b/nancy_drew_cw_cast_owen_marvin.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/compare_contrast_essay_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/yaskawa_ac_drive_v1000_quick_start_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e106970-3174-44af-9301-5ee1435a0ab9/vizio_e231-b1_power_cord.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/benzoic_acid_chemical_information.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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 5300 bytes
SHA-256: 2ab709bbb95caee39ef68c8c107dd1d5cdadc4a78d942472787f2ebf3b7c552c
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10388 bytes
SHA-256: c5350c6e51862ea49830f4e259787ffe76c7140dc54d20de48b31648aeb68b45

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