Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64cf2edb4071050…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 09:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 670b504cb3930d8d0fbbc82c813cb2c9 SHA-1: cc87ba1a8f38262c521b9edbff3425ed34f5dff3 SHA-256: c64cf2edb4071050e9d808d3430eedfe011dccdac33fd68af8512bc868374a2d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links to potentially malicious or disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=bsplayer+playlists+android PDF link annotation
    • http://train-home.ru/adios_nonino_partitura_pianohs81x.pdfIn PDF document text
    • http://mitidogifomasis.iblogger.org/rodovuvurujuli.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/togeralivadavu-komeken-fokujada-vajumolurizuke.pdfIn PDF document text
    • http://monstergym.ru/jekunumi60b3w.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/elsX0kI/xifova.pdfIn PDF document text
    • https://wefigoga.weebly.com/uploads/1/3/4/0/134041661/latowej.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/b1d2b.pdfIn PDF document text
    • http://fly-drive.online/faxipitovizebunariturojab6gfe.pdfIn PDF document text
    • http://freud.icu/glass_animals_the_other_side_of_paradise_official_video59n0h.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/engineering_chemistry_books_for_1st_year.pdfIn PDF document text
    • https://fozanisatede.weebly.com/uploads/1/3/4/6/134691357/8878662.pdfIn PDF document text
    • https://fuzidofan.weebly.com/uploads/1/3/2/6/132695445/vategigonugatu-tazazezamovu-gafabedez.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/hdv8wVk/88863819748.pdfIn PDF document text
    • http://gsmall.space/xasufevepanadcz1x.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/20ae2917-99b0-466c-b679-18accf05caa4/is_there_a_cad_app_for_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97c7fdb-705a-4001-b2a6-6849eb06840b/92659878572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ab6a1d-b0b8-41c5-9fe0-de91ff3d3e04/kafojesa.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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 5104 bytes
SHA-256: d169e99c4b5a7be164fc4e8755a556852b3e5400ccf408a89246c5a0f39141ab
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 15624 bytes
SHA-256: 671b2bf3f5ea86850c070cbe5ab8dd87e2df53294df059d5a05ec5ac8fb78aa4
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

Open this report in the interactive analyzer, or submit your own file for analysis.