Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a8c8dc986538d…

MALICIOUS

PDF

73.6 KB Created: 2021-04-02 09:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95cc336ad76748b285a3eb5cebd36734 SHA-1: bd29ed753304a113b54bd8cf3952d9f6bdd31459 SHA-256: f75a8c8dc986538d82faade3828f60b0bb7203a4852aefabc7adfd441e73d5d0
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 to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=is+mike+holmes+married
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/b3790fd480.pdf
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/zobobusowosoremod.pdf
    • http://4d-5d.com/74998386647cx8py.pdf
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/nipifagumubeji.pdf
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/7c5872d78a16.pdf
    • http://stav-games.ru/who_is_stephen_kings_literary_agenta1w2z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/143ffda2-465a-4665-a45e-9ff40247618e/nkjv_open_bible.pdf
    • https://s3.amazonaws.com/viromibukoleliw/1380633273.pdf
    • https://uploads.strikinglycdn.com/files/30e92f70-3ba8-4f57-9420-d8c475c817a6/52507627733.pdf
    • http://ruxofepugoloma.rf.gd/29153112616.pdf
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_2424a363818549b083712af81e269f5f.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_1cd14f06c2e8494bac01e2d37ad1409c.pdf?index=true
    • http://nunitew.rf.gd/32069711028.pdf
    • https://s3.amazonaws.com/dukavunivifa/angular_pipes_date_format_dd_mm_yyyy.pdf
    • http://bemerolafun.epizy.com/pudevavukegesisuxen.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_d5e3f9501540471db969cc0105afc529.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_f6a151b53f4847c48455a70cb0363df5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e27b7e3f-a9db-45bb-8893-bf2af57bad44/zelobosaxuvilerimetazi.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ae3f98e85ca24116a949f33a4a9b2e43.pdf?index=true
    • http://xuzagavolikop.epizy.com/20872323983.pdf
    • https://s3.amazonaws.com/tapelu/kitemutalelerukiratope.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_off0000e317.bin
fd6f2a0574925858b1381a215c7b408e0f0732e33fd4360d0ec26d0880ad994c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 5068 bytes
font_01_sfnt_off0000f423.bin
d6308388cdbd4daae0a59afa033b88c4dd97b8c2fe402e8a01794167d4adf3dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10932 bytes

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