Malicious PDF — malware analysis report

Static analysis result for SHA-256 b476ba4ababda8cc…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 02:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1ccaff44f4d40353979e345dbcaad5 SHA-1: 77bd72f3079f24343610d434b00cd66b7406f260 SHA-256: b476ba4ababda8ccfe9d11f7972b9646488ebbc03653046493e42d915b1dc384
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, identified by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains text related to 'hotspot free with unlimited data sprint', suggesting a lure for phishing or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://xezojetit.ru/strik?utm_term=is+a+hotspot+free+with+unlimited+data+sprint
    • http://wide-mean.top/2766817091331hum.pdf
    • http://instapriz.website/760579899817bbns.pdf
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/1218455.pdf
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/9922125.pdf
    • https://xizuxukavawot.weebly.com/uploads/1/3/4/3/134376570/4178750.pdf
    • https://cdn-cms.f-static.net/uploads/4461766/normal_5fe7ceb2ac7b7.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_60458eade0195.pdf
    • https://tanofome.weebly.com/uploads/1/3/5/3/135316841/wuwupagawumazuje.pdf
    • http://redtea.space/train_shunting_puzzle_gamegh7cu.pdf
    • http://quinzsy-studio.design/freightliner_radio_resetxkwrs.pdf
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/majojuxilose_zawud_pifoxasogupel_xuvobugobogo.pdf
    • https://cdn-cms.f-static.net/uploads/4499283/normal_605012b308c43.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_8e22e27f50ac4e228a5eaf3062b49550.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3a54c0b34eab48a796533ed250ff7bc5.pdf?index=true
    • https://s3.amazonaws.com/muvazi/font_awesome_5._8._1_cheatsheet.pdf
    • http://gadoxijumulop.epizy.com/animal_farm_pre_reading_questions_answers.pdf
    • http://kuviwobabevi.epizy.com/sony_fs5_mark_ii_gimbal.pdf
    • https://s3.amazonaws.com/bofake/31702896615.pdf
    • https://s3.amazonaws.com/davawina/super_3d_car_racing_games_free.pdf
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_f6c4bd7f4d494c34917fad672aa82883.pdf?index=true
    • http://zekovulelopur.epizy.com/zupanebetexudowidilew.pdf
    • 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_off0000fda0.bin
154380272a145977c224a7069c08561fe20f8d9ad405c70ea0295e7f79d44e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 5312 bytes
font_01_sfnt_off00010f9b.bin
6a250e9aa3db2fa47678cba6b7d15287a179045de518796af747804c6c96a993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 11280 bytes

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