Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8c2cb99fb561d…

MALICIOUS

PDF

91.6 KB Created: 2021-05-21 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f7cdced53055ba9b6a2096c88cc262a0 SHA-1: c64c32377efd1a295cbdc92b1156b288667c834e SHA-256: d5c8c2cb99fb561df3655066503678bded20e76c30948453695397899434e021
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm for SEO purposes, likely a phishing lure. The primary suspicious URL, 'https://mezovuduw.ru/strik?utm_term=innova+3100+rs+user+manual', is flagged as a redirector. ML and ClamAV detections strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/strik?utm_term=innova+3100+rs+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478408/normal_606d5b8473202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5ffeee9466f28.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/2368301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_604d63f00f1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_606e370fbee12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_604f5d37984c3.pdfIn PDF document text
    • https://kogexabisuzim.weebly.com/uploads/1/3/4/3/134322867/e277dfbe05.pdfIn PDF document text
    • https://kerawitoges.weebly.com/uploads/1/3/4/8/134878251/benepav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_5fe0d95a756db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5fdab334e5c20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fcacc2530a35.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/5ebe08f4-4f1d-4b85-b19b-b39889f62f09/angela_davis_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1b30e9-10c4-4790-aca8-d7e31722facc/el_regreso_del_caballero_dela_armadura_oxidada_resumen_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/58746352863.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lovilemavuvuzujumosededal.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/migogijimiberusuleledif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a9d894-b338-4fee-abe6-6652d8abd02a/what_does_a_chit_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7c78b5-d915-472a-857e-da317bdf5826/81272543415.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/69871143312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ad4b48-8b3b-444d-adfe-b0edd5b6ca75/how_do_i_manually_sort_rows_in_a_pivot_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f138c30-641d-457c-b7b5-abe6dcc46db1/57182033576.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_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 5184 bytes
SHA-256: 79ba097e03ed7df9da5cbf8209420748246125bd25c8812d8ae03ade82144a34
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 12728 bytes
SHA-256: c8318c1f165f3792402859820896479a535aa1027d52e43ff0ba10f09bbc64b7
font_02_sfnt_off00014ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA8 16136 bytes
SHA-256: 4a82d930af4ff3021f3d19cbd37464c8e664c90bef13661c9db69df894853898