Malicious PDF — malware analysis report

Static analysis result for SHA-256 75753f012922e655…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 12:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3bb6fa0e7e7c8262ee8e335f105fc7 SHA-1: 80c9c5f2e1cb4230be0926c4b307c81f2bab99a2 SHA-256: 75753f012922e6553fcbfa24393435eb4a8f61ccd7dd4e61d3e172b7fcbcb5fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://jottigo.ru/wix?keyword=2015+to+2020+dietary+guidelines
    • http://nutetuxiv.mygamesonline.org/kujeka.pdf
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/a333e4c35b2c.pdf
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/6345262.pdf
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/falatijewade.pdf
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/zogin-xavoj-giwejesobex.pdf
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/punukobesako.pdf
    • http://rotelebi.22web.org/renogukavazavovedek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_ebb4755ae1324d17944a097e9429fc0d.pdf?index=true
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_508dc9ea010d456b8b37c8858ca91dfc.pdf?index=true
    • http://porekeb.epizy.com/padovijaravotatup.pdf
    • https://s3.amazonaws.com/zeworibuzoza/yamaha_mg102c_power_supply.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/yamaha_rx-a730_receiver.pdf
    • http://zugagib.atwebpages.com/adjective_and_adverb_list.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_1193a35513ec40558fdf01c569fd8f0e.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_6ae6f7628d6e482aae3d6c24d8421d75.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_37c2d825e7024941a19ef24d4a057711.pdf?index=true
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_4fa51edf9d644671aca548272e791ea0.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/56006717909.pdf
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_0aaa475a0daf474585348d6e38124285.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_off0000e5c0.bin
6da44b4f0b1e6017521202e64da6112d98b0f2aa09272bc26141baf6dff63084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5332 bytes
font_01_sfnt_off0000f7e9.bin
4d6f259fffdc1ceeb49692e31a1404d302aad3679efa4f055f1c704c77564ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 11136 bytes
font_02_sfnt_off00011dd8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 4324 bytes

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