Malicious PDF — malware analysis report

Static analysis result for SHA-256 965ddafc56d0f1cb…

MALICIOUS

PDF

70.5 KB Created: 2021-03-23 15:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59a07cda4c71a7bfb34fa02009368824 SHA-1: 5b97c521616b130d3fe0ea85510b2b278127395c SHA-256: 965ddafc56d0f1cb429bcd2de9ff2bfb956a961013a1171384368de0561ecc0b
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 0.9996

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://gimoguvi.ru/wix?keyword=level+f+unit+10-12+review+answers PDF link annotation
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7413103.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/jageboximuxewu_banusova_vaturipetipawi.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/bizilalanuxiteme.pdfIn PDF document text
    • https://lexikujufuwu.weebly.com/uploads/1/3/4/6/134613894/losuwutozuse_fenibedu_dukowel.pdfIn PDF document text
    • http://motuteb.22web.org/95088327998.pdfIn PDF document text
    • https://rubepaleve.weebly.com/uploads/1/3/1/4/131454262/kedazegujodav.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/dulapewowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_6034d1dd409f6.pdfIn PDF document text
    • https://rukewopesix.weebly.com/uploads/1/3/4/2/134266340/d25b331f.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/a871cde4f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601b66776e748.pdfIn PDF document text
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/metikisezawu.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/8593441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_6006b165e5a0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_90008b4c84944fc7a149f67cfee81fbb.pdf?index=trueIn PDF document text
    • http://nerakovunimi.epizy.com/attestation_sur_l_honneur_990i_carac.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_da94e4e578e54026b1c087789be2b436.pdf?index=trueIn PDF document text
    • http://jokezonuwekuj.rf.gd/self_driving_cars_technology.pdfIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_5e5498f540b8489e8f011a14723ac6cd.pdf?index=trueIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_dbf6f43a964d4659b77f355e71ae6fb7.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_06d88117bc52430290410ded08b9f5ac.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 5212 bytes
SHA-256: eeccc74ec90e530b47ad61bbe1428ba584aff190b4516f84bc87ec79248b15ac
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10112 bytes
SHA-256: 8d838c5c083db6fc86b8eca06ab2b72a5d70d241359c2817edb6ced6b2dfc3c7

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