Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e8730d2a0999cb…

MALICIOUS

PDF

69.0 KB Created: 2020-11-20 23:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e3a1ddc853a24c6d408f4441693e7705 SHA-1: 7079b1810893e5b16a9c1aec607632389850b1c3 SHA-256: d7e8730d2a0999cb0c6421100348750a0faf9fdcebe8644b3d15b623fe25afa8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=bluestacks+app+player+free++for+linux PDF link annotation
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/10af4587.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/833938.pdfIn PDF document text
    • https://vumerumub.weebly.com/uploads/1/3/4/6/134634189/govagipulufeja.pdfIn PDF document text
    • https://motuzasejufabo.weebly.com/uploads/1/3/4/4/134498516/jobujoseb.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://mobojifukan.weebly.com/uploads/1/3/4/6/134688158/2168728.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/lomesinumev.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/93d29111-5b8a-459c-997f-5e6a02c3b139/slides_generos_textuais_ensino_fundamental.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/anticancer_drugs_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cf144f-3fdd-465a-b1fd-2ddefb255f6f/wudakalunej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943850bc-bbf5-449b-a4c0-9387963d6a10/43264249428.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/wenujudisixafenixadonig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff26884-36fa-45ca-bf9f-4cc6ac4e5e09/50647393015.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/tender_my_resignation_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/what_is_the_definition_of_dysfunction_in_sociology.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 5292 bytes
SHA-256: 29e56f1126e55c193938db2fd57e2171f82c0765b842cf16fdb7e9db55c7f368
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 10540 bytes
SHA-256: dd2ea50c38268f6925e1891b285a0240df01cb0bc9ebc1d6d0b8bec98501982f

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