Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8d0628d7069145…

MALICIOUS

PDF

79.7 KB Created: 2021-04-02 16:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ae98efbf5762a6c24e8f8fd0a5e282c SHA-1: 1b0ee16d5b2b3eec056248023ee471fdeb70f488 SHA-256: 7b8d0628d706914591bbc2985c952d8b8f01674602d2ba37c00d49f7217ee799
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=panasonic+bread+machine+manual+sd-yd150 PDF link annotation
    • https://cdn.sqhk.co/sesizame/hc98jfu/12412268536.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/12d0995.pdfIn PDF document text
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/2490925d.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/tigopaliwetebu_mikakisarotuw_nulosukez_wonomot.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/jbhiOjf/fizax.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/e7345d83.pdfIn PDF document text
    • https://cdn.sqhk.co/raxavetaletu/lyHidia/vampires_netflix_series_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6313946-64ab-47ba-8677-43741ff4457d/novel_sword_art_online_jilid_19_bahasa_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cb132b-a2f2-4fb9-9873-0af1d951d41e/can_i_make_an_appointment_to_renew_my_drivers_license_in_texas.pdfIn PDF document text
    • http://dowawin.epizy.com/biwaluta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a33395-c46b-47aa-80a9-afe47a45bed5/xefisezakezipivij.pdfIn PDF document text
    • http://walefofu.rf.gd/what_does_mourning_wood_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2bcf61-eaa8-4010-8009-a49d56810616/lajusepofarubafafeled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9726666c-009d-4ee0-873f-9b4d9ca9a261/what_are_the_five_types_of_imagery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88708979-510c-4dba-9daf-ede22adc5a9e/how_to_use_blue_yeti_usb_microphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472753c9-ef64-4cee-993d-4494b1e01498/best_bar_for_echo_cs_400.pdfIn PDF document text
    • http://xisamepujozupil.rf.gd/dazilatijulavuru.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_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 5772 bytes
SHA-256: 2d4d721505fc1a47714058b36a86206b8f189dfe953d608528789ca98dae8f08
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 10276 bytes
SHA-256: cf588c7f570205e699abd609861e3fd248baded6990431d776fe6b6773b0e04c

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