Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f49d2e2e03efb43…

MALICIOUS

PDF

89.4 KB Created: 2021-03-17 04:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f5a4832d89d2e2af6ced2271a527c3f8 SHA-1: 25d75af230f2bfed7fe15823ce2c77d5efad0285 SHA-256: 3f49d2e2e03efb4313b2b8a047bb4f356e371844e0a9cd1c3d7b6396258daa6e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm or redirection service. The primary URL, 'https://seumenha.ru/strik?utm_term=is+it+illegal+to+buy+fake+reviews', indicates a lure related to online reviews, likely to direct users to malicious content or phishing sites. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=is+it+illegal+to+buy+fake+reviews PDF link annotation
    • http://nubatevujonuw.mygamesonline.org/wivinusuwegosobivibake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_60192951db919.pdfIn PDF document text
    • http://sedobepotorosi.22web.org/kenmore_elite_french_door_refrigerator_ice_maker_leaking.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/asana_pranayama_mudra_bandha_-_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fc792732ddd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_5b2bd26ea24542429100af2f433f9ff6.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_964b7cce2db54047886694cac2f88920.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_00e979afcdcc4fedbaa2862a7107b416.pdf?index=trueIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/manual_pedaleira_zoom_505_guitar_portugus_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/fojakirogovitezafinigoja.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_eb739b79669e41c3be6b3993f47d40f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/vodutuwiboraw.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_cb878ccd2d5649b2bf046b1b96369b7c.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_933cba33406047598e426e9f86e09ebc.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_735e920ced204216bc5f30a6258d8666.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_894f32577ef04700b4b41e4ed659ecc6.pdf?index=trueIn PDF document text
    • http://dimutarodil.epizy.com/apogee_and_perigee_in_satellite_communication.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/kovevunasujoruv.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/oppenheim_signals_and_systems_2nd_edition.pdfIn PDF document text
    • http://leludopovofa.rf.gd/ruseli.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/focusrite_scarlett_2i2_2in_2out_usb_audio_interface_3rd_generation.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_8f9840cfa8a54c1f9805b317b5924e60.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 5328 bytes
SHA-256: caa05f956801703b3d0da57ee39c1fff276e512a897bf070bbec8cacf1e4ae4b
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 11676 bytes
SHA-256: f6195357fed233781f5cb0b0ba76909f817cf9b2080aa8081f0d752c30a22f38
font_02_sfnt_off000142e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E1 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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