Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fb1b765a2443e6…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 22:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 19b4f5c653ad4cfd4e1024488b4025e6 SHA-1: a4f2c7cd20dc263c048a4250ab04df26eabdee49 SHA-256: d0fb1b765a2443e6ebcd74a320668c6a1a79001448a44d301dbd18bd08366aea
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to free books, aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=alejandro+dolina+libros+pdf+gratis PDF link annotation
    • http://sifisomatexow.sportsontheweb.net/52317107193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_601d5e21b268c.pdfIn PDF document text
    • https://zozumufixava.weebly.com/uploads/1/3/0/9/130969508/8577640.pdfIn PDF document text
    • http://jugapus.sportsontheweb.net/81297217089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_60039188dc016.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/380b71786a27c37.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/6367015.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/bubapumon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366035/normal_5ffaca8b554b6.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/how_do_you_read_a_tempa_dot_thermometer.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/cours_d_anglais_mdical_gratuit.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/grammar_for_english_language_teachers_parrott.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/tavile-dujegufegudu-velexevosaxevok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_a59d2853f4f548ba834797bcc182b72b.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_fa540282d566438d9584f5517ab71594.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/banjara_nama_in_urdu.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_96305eff3087407ba1f1cb1d973d3015.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_25bd09969b9a4ebeb3698d10806aa6d9.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_2dd060a0ace645849e1e704cc5bf4c18.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_aca25e23a7384892801ef7f24fabad50.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_34e01a26f31f4731b6ae6ff6205aff02.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5416 bytes
SHA-256: 6eda79288c13c235457d7c7f2801dabac90e4055a884f67a4541e9b4bd7eadb1
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 11800 bytes
SHA-256: 72a88fe00d0c9dd768d6fceefb8eebb031ca994df854f1d9e2913fa637c633c2