Malicious PDF — malware analysis report

Static analysis result for SHA-256 48de03efe9f7f67b…

MALICIOUS

PDF

74.1 KB Created: 2021-03-10 01:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a96b1ed5f057047d4077368dec6b3365 SHA-1: 5187736f8443a655ea02af1e8fd9161175193d5e SHA-256: 48de03efe9f7f67bf22850e41ab856a121d582b9d146e81af729a110d41e44b6
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on Weebly and other domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be related to a 'cheque book request form', a common lure for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/123?utm_term=sbi+cheque+book+request+form+word
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/4d7bb5.pdf
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/1976561.pdf
    • http://kikababono.mywebcommunity.org/digital_marketing_bsc_london.pdf
    • http://jiteruruw.sportsontheweb.net/mizutu.pdf
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/riwivugute.pdf
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/8507099.pdf
    • https://sorezoxawo.weebly.com/uploads/1/3/2/7/132712551/degazon.pdf
    • http://saxobupazes.sportsontheweb.net/wexevipevivatikuvub.pdf
    • https://lozepexowazabi.weebly.com/uploads/1/3/1/4/131409761/53fafa38de07.pdf
    • http://afracheat1.xyz/canon_mg3520_driver_windows_xp8pt9d.pdf
    • https://tarofojazen.weebly.com/uploads/1/3/4/2/134235484/xidokujuv_buvoxunapeduxaw_juvibajatu_kezisizog.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/7736465.pdf
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/puvaz-motemojumakasut-vovowusosemabet.pdf
    • http://mukinumatonewo.getenjoyment.net/where_is_the_setting_of_the_story_pandoras_box.pdf
    • http://daravto18.ru/81345353064v29t8.pdf
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/bonijolem.pdf
    • https://kamubopo.weebly.com/uploads/1/3/4/6/134631829/02dcc.pdf
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/jakexa_tedepogoniv.pdf
    • https://tizupimarijifik.weebly.com/uploads/1/3/1/6/131606002/2bb969454a3.pdf
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5ffc9c4aa2456.pdf
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fc68169c675b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e441.bin
54015bff5b22197351214cda20e93a9a7ea74818d266ed7544b876d9853d184c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 5544 bytes
font_01_sfnt_off0000f705.bin
b16b178740a18293bde87ba6f49a26e178f37100390997f0a2cb5f67fa2162d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10672 bytes

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