Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56437b10bf59070…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 10:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cc9e200763781a3328c7a9acd66f315 SHA-1: 3d8520411d9fe43f38c329124a48912f06fee529 SHA-256: d56437b10bf59070fbdb193a3861465897ceef9c066774657180e6466d105308
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing, with one URL specifically mentioning 'bank of america bank statement template pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=bank+of+america+bank+statement+template+pdf
    • https://static.s123-cdn-static.com/uploads/4384640/normal_600100eeb002b.pdf
    • https://static.s123-cdn-static.com/uploads/4374203/normal_600843edc4663.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_6040c2b823ee3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c575b42-8765-4c92-bfb7-7d10142d646d/65534140355.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_beafa8a661154212ac93a2c254743348.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e5243a6-becf-4db7-a241-6d760afa652d/asus_rt-n12d1_firmware.pdf
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_090117e0c64d4ce797030bee7c6e66ef.pdf?index=true
    • https://s3.amazonaws.com/doxifuba/cardinal_and_ordinal_numbers_english.pdf
    • https://s3.amazonaws.com/kigavanus/he_jagannath_odia_bhajan_dj_song.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/famisefox.pdf
    • https://uploads.strikinglycdn.com/files/bbb1d00a-82a7-44d9-9898-c1413a0c6b8e/ssr_125_exhaust_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/ba589456-cefb-49a2-801f-bdd7e2cd91dd/detail_knowledge_of_tcp_ip_model_and_osi_layer.pdf
    • https://uploads.strikinglycdn.com/files/0db78b78-583e-46e6-9e85-664d795ceb8a/1998164126.pdf
    • https://uploads.strikinglycdn.com/files/e3f0e5cb-92b2-421d-b17f-ecca0b4ffc6a/1907879462.pdf
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_8b8b875c448840dcbedf3526a1cc9c02.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/ao_smith_35000_water_softener_manual.pdf
    • https://s3.amazonaws.com/bulolimepol/83634793016.pdf
    • https://uploads.strikinglycdn.com/files/b9c25807-b17a-46b2-a342-fec5647290b1/integration_of_cos5_x_dx.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_off0000e9a2.bin
869347f4780f66eb69c1b42d3eb0ff465865e508d85621129456618ba3fe9fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5552 bytes
font_01_sfnt_off0000fc6f.bin
8133a8f96716dbca29dc7c333a7b7c0b2eddb2f27949218c2980591d5d165c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 11064 bytes

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