Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dbf2a6e824f25f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 17:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 735d1a6388db658a485efbd101cc7687 SHA-1: 946abb7811d91552bd9e3ac7a049da2549714f20 SHA-256: 62dbf2a6e824f25f56ff5f539fd08f539adba9da8d82fce47bb4a6e2f4307490
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of numerous links to disposable hosting further supports a link farm or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=congruent+shapes+worksheet+gcse In PDF document text
    • https://pegupirorig.weebly.com/uploads/1/3/1/4/131406852/8048321.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/2146182.pdfIn PDF document text
    • http://getsalle.xyz/172550339085y4w1.pdfIn PDF document text
    • http://wirelessinfo.ru/asrock_z87_pro3_cmos_resetxpyvh.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/3280597.pdfIn PDF document text
    • http://rankingcoach-seo.com/20859040031dm3s2.pdfIn PDF document text
    • http://sesosorav.iblogger.org/the_five_love_languages_for_singles_summary.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/3554c5f48.pdfIn PDF document text
    • http://somukegizos.66ghz.com/84333668773.pdfIn PDF document text
    • http://helpcopyright-service.com/zixovuwudo9a7rx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimamosapike.epizy.com/bubble_level_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/paid_time_off_upon_termination.pdfIn PDF document text
    • http://xanawuvogi.epizy.com/business_report_format_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/92516098283.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/psychological_factors_affecting_consumer_behaviour.pdfIn PDF document text
    • http://fawexoja.rf.gd/77395086897.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/graco_nautilus_65_3-in-1_harness_booster_rear_facing.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 5224 bytes
SHA-256: 094f47eb0bbd53c776fe93ec4892b62251c534dcc122e49ab9173abcf38f17a2
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10092 bytes
SHA-256: 08af4331c785bf0cf78322b3837c2fedeab2232a8b05a0b454c351b446117961
font_02_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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