Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23325a70abaf8de…

MALICIOUS

PDF

121.4 KB Created: 2021-04-05 15:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d45b7842bc8d19648098e7da9df51cf6 SHA-1: c769a6fc4d03e8d289d163c8d2ca7a9357caed76 SHA-256: e23325a70abaf8def6f543bcf8db1b751852ec62b6e48364fe7f0e2a1013e87e
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 0.9997

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://golowaki.ru/strik?utm_term=us+military+phonetic+alphabet+chart PDF link annotation
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/5a021d392c2667.pdfIn PDF document text
    • https://valijobeguxufa.weebly.com/uploads/1/3/4/1/134108929/fumusirido_rokalamiro_wijogiwakar_dederisojaxozo.pdfIn PDF document text
    • http://sandiego-podcasts.com/luvipufujonlfblx.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/d825c5.pdfIn PDF document text
    • http://xebenijafojomef.iblogger.org/how_to_convert_to_musicxml_free.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/runejirorop.pdfIn PDF document text
    • http://pemewozeresozo.22web.org/sudekutivurijutepaji.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/gijelaforag.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/8944881.pdfIn PDF document text
    • http://okrasote.info/sezatuzugarolipvw7ii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulekugigewipo.epizy.com/zoduxigurefuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa6c065-20bd-41c8-a063-1ef9cb210f4a/perfume_the_story_of_a_murderer_full_movie_download_in_hindi_720p.pdfIn PDF document text
    • http://zurufeb.rf.gd/49870507018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68caa56-e617-407d-9fbe-f48653fa0f19/xosisunebokoledop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c85f448-7177-4784-9119-fdfa6112de32/vitunutixijogagisetokika.pdfIn PDF document text
    • http://judixipe.epizy.com/slickgrid_column_header_formatter.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
    • 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_off00017fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFF 5408 bytes
SHA-256: 3eb9ead01d6ea1ade7bc77f777b61f900e9b7ffc0a142eac9c65ad3004c4cf93
font_01_sfnt_off00019239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19239 15856 bytes
SHA-256: f5daef7a0ea9696dc867da287fdda397a2f8ee198d37fbbcaff9ff7a6e452c16
font_02_sfnt_off0001c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C282 16116 bytes
SHA-256: 757edbe9ca696dc752e8794cc2fab55b744a24b197aba41abea0c8f583a0f3ca

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