Malicious PDF — malware analysis report

Static analysis result for SHA-256 683be94de40acefb…

MALICIOUS

PDF

73.8 KB Created: 2021-03-24 18:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4555e9a26fbfbd8c143b69278d28c458 SHA-1: a34a189ea259a6f37588d92052378c31af071ef9 SHA-256: 683be94de40acefb0c3f1939326d41b52fedc891f75d894aad07d041d1d50983
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on free web hosting services, indicating a link farm or distribution mechanism. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://botokaw.ru/123?utm_term=correlative+conjunctions+worksheet+grade+5
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/8917685.pdf
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5ff4349b41feb.pdf
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/nulibolozone-xufixe.pdf
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5feeb80bbfbf6.pdf
    • http://lirinevewafa.mypressonline.com/wamutisusa.pdf
    • https://zigifivabukom.weebly.com/uploads/1/3/4/4/134460242/9529645e6df.pdf
    • https://static.s123-cdn-static.com/uploads/4426942/normal_5fcca45a19d9e.pdf
    • http://xasedogamif.mypressonline.com/bin_sachivalay_clerk_syllabus_2020_ojas.pdf
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fd8601466453.pdf
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/7423705.pdf
    • https://negopipeminote.weebly.com/uploads/1/3/4/8/134885603/73447.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_60244b7b848e1.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/92bd9f970df3a3f.pdf
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/3c74dc.pdf
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5ff950e04869a.pdf
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/9a2c1d89d961.pdf
    • https://static.s123-cdn-static.com/uploads/4374203/normal_6006f1cea751c.pdf
    • http://nigodofifulo.scienceontheweb.net/31902042796.pdf
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5ff17b0adb4ee.pdf
    • http://sutezesibopixiv.medianewsonline.com/perimeter_area_and_volume_of_all_shapes.pdf
    • https://cdn-cms.f-static.net/uploads/4426421/normal_604ab2d40cbf9.pdf
    • http://guparob.mywebcommunity.org/demudasaguranelijuvu.pdf
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fef9dbd79df8.pdf
    • https://wazepitufakox.weebly.com/uploads/1/3/4/7/134735855/f6d8a.pdf
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/cb0a1209cf86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86ab9842-d50f-47b3-81da-10c1790ffb6c/93270001527.pdf
    • https://uploads.strikinglycdn.com/files/d91fb2b9-0762-49bb-8754-88bb1419c780/vtr_secrets_of_the_covenants.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_off0000e174.bin
ecd76fc40077c2045b200c41c51538224bfc02e63b2d69b27d37b93e791fabd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 5524 bytes
font_01_sfnt_off0000f44b.bin
29e90c577aa93240e92360361e38762a4bac4f36dd57fb5f2fea7fd624b6ecae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10828 bytes

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