Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ac7f3f42f3f42…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95c5c57d520733ed536605fbd15c7811 SHA-1: d8a72db63aed588ab68d75d373fe55947b517015 SHA-256: 872ac7f3f42f3f424ad0e9398ae54211a584c4c0fab4988997bb2ec66ce2893e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL leading to a site that appears to be a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user 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://leonvi.ru/wix?keyword=beer+pong+unblocked+games
    • http://gepexoliv.medianewsonline.com/how_deep_is_lake_worth.pdf
    • http://gebuhrenfrei-mein.com/vawenizixevavelenusenwyc1.pdf
    • http://pifedalune.medianewsonline.com/probability_calculations.pdf
    • https://cdn.sqhk.co/xugikokazo/GhihegD/62515405306.pdf
    • http://mivetys.xyz/minezijomudonivuwelomuvr5iu.pdf
    • http://jopkapopka.online/how_to_draw_buildings_easywnxk7.pdf
    • https://cdn.sqhk.co/godezixibufo/fChgje2/duwesovomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_2d457680d5204891acb736acbfd593b3.pdf?index=true
    • https://s3.amazonaws.com/jusuberu/hebrew_dictionary_bible_app.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_23a8137d761b42faa92cce2dc1c1bf2f.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_b1fb443f3f8e41fdb68aaf5856e04980.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_a1afc62cf970463ab87bee92ed36f647.pdf?index=true
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_61c8b8de78cf40dfac66fb87e52b9784.pdf?index=true
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_ccf4f1cc568749f1870e3aef5dcc9266.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/can_brother_hl-2270dw_airprint.pdf
    • https://s3.amazonaws.com/numegubowalonan/what_is_profile_elevation_mmpi_2.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_892b9af980034a5fb2237cacb8ab1f1d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0a.bin
1ebee65a8ca479871e9bd8b6dbb08ccd181734d7dd32c68851ecff6f7af9f49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 5400 bytes
font_01_sfnt_off0001013e.bin
e0f88b788e1f9bd32e93b6d920884a6b06ca607930b79290ef1acdf0d800e044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 11028 bytes
font_02_sfnt_off0001271f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 4324 bytes

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