Malicious PDF — malware analysis report

Static analysis result for SHA-256 77717bb353b8eb40…

MALICIOUS

PDF

90.0 KB Created: 2021-03-06 17:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e820172257dd0978a42c5117df39adca SHA-1: 8340226036a3ba0a62a240a1d080ab6be2870a53 SHA-256: 77717bb353b8eb40965a889b9a55afc19c2ea8a6ced71bed2717ca6d1247b47a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or SEO spam campaign. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The primary IOC is the URL https://dugedepap.ru/wix?keyword=odyssey+draft+guide, which appears to be the entry point for this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/wix?keyword=odyssey+draft+guide PDF link annotation
    • https://soruxepamoni.weebly.com/uploads/1/3/5/9/135992355/26cc15f302b46e.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/sixivage.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/4815687.pdfIn PDF document text
    • http://gifawel.22web.org/gazivuvezelilabijataxu.pdfIn PDF document text
    • http://zalewef.iblogger.org/mibosalajo.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/4756642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivapatovike.epizy.com/cursive_writing_worksheet_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91d409f-94b6-44cc-8806-022c9f04bb8c/69152579263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af81f87-df24-4e81-a6bb-2501d7b3904f/reapers_bass_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/affair_of_state_movie.pdfIn PDF document text
    • http://golujaxi.epizy.com/14868401873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b589f2f-079c-4956-9e55-ce78f266868d/the_elephant_man_short_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886182d0-e90f-487d-b1ca-ef68abf1a3e4/discrete_mathematics_and_its_applications_7th_edition_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/greek_and_latin_prefixes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41e80aa-5ab1-4226-aff8-2e80e2089df3/cheats_starcraft_brood_war_expansion.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_e253149bdb69442ba4333b748a5da1fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/ranusezowewufadalalodexem.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/kutonikikoxilifuro.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_2ec6ac3f66ec4c44af793c7e1d124b6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/mavotekubevaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25c9011-f78f-49e7-a0d0-adc5ff451067/nugoxupewagaxodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af053e7d-a88c-4823-95f8-9c1df9cc61e8/48904409614.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013d6b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D6B 18448 bytes
SHA-256: 5828c5d075ddf0da2eb938d7a11b4f7c8cb08c2986f649e2e1e2168bae0b6d99
font_00_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 5172 bytes
SHA-256: 7e371b723fe9a312e9b28d84e82682d923906b7e3381ccbdaceca641ae576f74
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10716 bytes
SHA-256: 9107258ca218caca3994dbcfff7715142ac3025e77bb13dd20cefcf02636f5ce

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