Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b650afb1633e41a…

MALICIOUS

PDF

183.3 KB Created: 2021-02-14 03:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d27ff3796b46189ad2f3cbc4d3e3c1d SHA-1: d667732a83738b86d81e024187684253e8b4ba1d SHA-256: 7b650afb1633e41a854e3b6a65b83b7cba9100a9a99778733b71e10babb663b7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of '911 saves act benefits' in the document body, combined with the external links, points towards a lure to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=911+saves+act+benefits
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fe92bc4cc0f3.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601fb72987730.pdf
    • http://store50off.info/wozawolaroxomalr7l8.pdf
    • http://instgrmmverifiedbadge.com/18615073788tgqj9.pdf
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600d28d734032.pdf
    • https://rurajisikite.weebly.com/uploads/1/3/0/8/130813509/3144255.pdf
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/4781829.pdf
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/muzomiv.pdf
    • http://espaceabonnes.com/nautical_almanac_2019sa4ep.pdf
    • https://ziliseze.weebly.com/uploads/1/3/4/8/134855349/foxaxumiva.pdf
    • http://itravelgr.com/f1_mobile_racing_bahrain_setupk9dq0.pdf
    • http://electorat.org/47136875331pvozp.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/2c92a279.pdf
    • http://naturka.space/62998128857yw01d.pdf
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ffe4874385a1.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fed1ed314a60.pdf
    • http://help-ruleviolation.com/30474765819m66cl.pdf
    • http://onatural.space/63024734410q4057.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00028499.bin
89a0b136b926df67b250f456bf3c532236c55dd28addd1f5559c505c2a3fd126		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28499 34252 bytes
font_00_sfnt_off00024d97.bin
b9800c18f023a8d33c2b7c3fedc99626abc7a1e02540f8bcc36b4283410cf59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24D97 4740 bytes
font_01_sfnt_off00025dc1.bin
5103de6b4dff54bcfaf9f608e1630b7446dbe5cba5601e059f30e6bb401bd9b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25DC1 11420 bytes
font_03_sfnt_off0002bf99.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF99 4324 bytes

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