Malicious PDF — malware analysis report

Static analysis result for SHA-256 66020727c8cd3bc8…

MALICIOUS

PDF

81.8 KB Created: 2021-04-09 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4111a941093d66016b71f52eb6879f78 SHA-1: 12248d4380d322a5844788cbe752f15844931895 SHA-256: 66020727c8cd3bc8cb0a1e4ae8076adb966304ae43d4eb773910efe6f599797e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily corrupted, contains a title related to pellet stoves, likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=how+to+manually+start+a+pellet+stove PDF link annotation
    • http://kezedidakopu.iblogger.org/nausea_sartre.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/hiHgi6Q/game_baby_bus_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/jiNeK5M/car_x_drift_racing_lite_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/ib4lZhf/lijaxowuz.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/ethical_principles_in_research.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ie3igJ8/worms_zone._io_voracious_snake_2019.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/warisonemuladoridajofifik.pdfIn PDF document text
    • http://pekibule.iblogger.org/bncc_2018_educao_infantil.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/AgjiaIi/94420909857.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/83151683076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevavotubuzepu.rf.gd/solid_converter_to_word_free_download.pdfIn PDF document text
    • http://parezuz.rf.gd/inter_zoology_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9abcb2-4219-4459-82c8-0be6874bcf9a/14774623764.pdfIn PDF document text
    • http://jufalusa.rf.gd/6046826263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572946e0-236b-4ee0-a6a8-9c986cc3e7c3/zesolo.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/causes_of_lung_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7755b4-84b5-4bfe-a562-89726af6a1bf/facing_love_addiction_download.pdfIn PDF document text
    • http://jorujemefaf.rf.gd/english_word_synonyms_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20617572-1295-4328-adeb-002fc6e36407/7.3_powerstroke_manual_transmission_fluid_capacity.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/54358523034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1686631c-2bd0-4bb5-8761-01255817c851/jogidakufaxuj.pdfIn PDF document text
    • http://lifapalifarivug.rf.gd/turidomaruxozuwajarilami.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 5180 bytes
SHA-256: 91566387eee7dd036ba1d653fcf5e195cc00cb1a5a2c4d42d95a3d3a60b9ab24
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 11420 bytes
SHA-256: 84917c348165ff993055945f1445adb1c612c1b6840ee1048b64baf8d08feae8

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