Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b71f55d3744357…

MALICIOUS

PDF

69.3 KB Created: 2021-02-18 06:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5dd24cdf78d90280b4d26f308fa4e025 SHA-1: 091dfb612c864b71b9c5aaab574778f0c31d76ca SHA-256: 75b71f55d3744357ebf82197373edba94c749ff472d747597243ebfdad9e277e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=deer+predation+or+starvation+biology+corner PDF link annotation
    • http://rupitori.66ghz.com/introduction_to_agricultural_and_biosystems_engineering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_5fe9213a3f2f0.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/lalodizakosedujafa.pdfIn PDF document text
    • http://remont-pc.website/bobibaferofyh1t3.pdfIn PDF document text
    • http://bigchance.pw/onde_est_wally_jogo_androids8wu1.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/nawedadexoresif-visigexotodopef-lebilekonof.pdfIn PDF document text
    • http://disconto50.info/23070725807j79ne.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/9751f1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_6001006a519d2.pdfIn PDF document text
    • http://trokot-tonirovka.online/best_stock_app_for_beginners_canadau6840.pdfIn PDF document text
    • http://instapriz24.site/avery_5160_template_google_docswmjq7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60243aa1757b1.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/duzijujazabigidareba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fe06091d3950.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/kedikuf_xijexagegabuvup_dakamumunawo_nalowoxajabane.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/muvazi/49402966835.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/guilty_crown_euterpe_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/google_android_apps_dark_mode.pdfIn PDF document text
    • http://dujawupiraxep.rf.gd/writing_money_amounts_in_words_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/phishing_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/blank_calendar_format_2019.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5540 bytes
SHA-256: e052a9f63d6229eb6d3d7547c957fad94b0edc58803597bed9f0124e6acdcc50
font_01_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 11388 bytes
SHA-256: b9cec5ceaf56bbfd9c87a7567315298d783a0183a39889f01ce514f70bbdb278

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