Malicious PDF — malware analysis report

Static analysis result for SHA-256 9987fd1d06017401…

MALICIOUS

PDF

76.4 KB Created: 2021-05-02 09:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9263960e9510d84629dda63c42960b27 SHA-1: 944973dc1d93ef96232d92863d1cad3677372169 SHA-256: 9987fd1d06017401c5362dfeb73ceb2fc1fd0b5c66ffcbf1e78ff23c48b230c9
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one identified as a potential phishing lure. The document's structure and embedded links suggest an attempt to direct users to malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=sas+white+papers
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/netevaziluken_forifoxotib_bizatupeminabig.pdf
    • http://legumajati.22web.org/89798776300.pdf
    • https://joponavo.weebly.com/uploads/1/3/4/2/134234964/sisuxa.pdf
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/zexexederer-duzezufuvowo-wolakezuraxopil.pdf
    • https://wivepeweg.weebly.com/uploads/1/3/1/4/131455463/1e7a8d8035.pdf
    • https://rolemefusibo.weebly.com/uploads/1/3/0/8/130814279/natixuxazovodoxixug.pdf
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/wokapijoloxab_zemexekuwu_zepage_mobapabexuvut.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/8227975.pdf
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/pexifi.pdf
    • https://dugepenen.weebly.com/uploads/1/3/1/3/131379306/6888825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_92ea4d493da24e629b461bc942703ff2.pdf?index=true
    • http://jajaxarok.epizy.com/15219484559.pdf
    • https://uploads.strikinglycdn.com/files/30a2f4c0-4c25-4d61-bc1e-1ebc4d37e034/appointment_meaning_black_law_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/e40531fa-0112-4d37-bcc9-48e3fd8eb211/93446464851.pdf
    • http://zovewopot.epizy.com/gorumenoloxolarifuperi.pdf
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_f1aa7349493049fa8c089520d0c6f747.pdf?index=true
    • http://bomotunitalelug.epizy.com/writing_assessment_criteria.pdf
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_c8fd8b16d0814d28a51dd76072e08b02.pdf?index=true
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_7469a1bb04b248ba991a15b6219a0e16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2ce56cd-096f-445d-b027-121ae4f73934/lekotupajetoturiro.pdf
    • https://uploads.strikinglycdn.com/files/5d0d5d5b-5a8f-4010-95a3-91025fa51fc2/winter_wonderland_wedding_centerpieces_ideas.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_off0000eea2.bin
1cdf66a1b62658170c06ed26b7209c65a0248512abde1e6e8d0de80ae53d57ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 5072 bytes
font_01_sfnt_off0000ffe9.bin
63c575ba8ca4f88d362b6758e77058a3485d8e818a6330f16ec65927ab63d4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10876 bytes

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