Malicious PDF — malware analysis report

Static analysis result for SHA-256 e604c05ef9e0d580…

MALICIOUS

PDF

77.0 KB Created: 2021-05-23 01:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bb59ff8835982f4d4305ab76707d8405 SHA-1: a706d1d67fd052f3cbc7a5c09b6091aa4fe71025 SHA-256: e604c05ef9e0d580efa0005959f20516080075b887db99e6d0eb5df7fab6c5f2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-confidence heuristic firing for a redirector link disguised as a free download lure. The embedded URL, https://maypoin.ru/strik?utm_term=does+asana+have+a+desktop+app+for+mac, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=does+asana+have+a+desktop+app+for+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6065c9cd3f296.pdfIn PDF document text
    • https://burakizu.weebly.com/uploads/1/3/1/0/131070688/6728516.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/2033052081c8894.pdfIn PDF document text
    • https://koxipaburejoxow.weebly.com/uploads/1/3/2/6/132681725/2e350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_602735efbb233.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/sijemozonadimatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_601bbb28afd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6059716155f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6023aa9b00d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_605b8f6aaab5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5ff7c8db91c45.pdfIn PDF document text
    • https://vinazova.weebly.com/uploads/1/3/2/6/132695356/592eacff01b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fff9890c9b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_604cbe5664fcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/febopa/five_senses_cut_and_paste_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/idsa_clabsi_prevention_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/netgear_gs108e_v2_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/90904006314.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/lixijak.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/yamaha_ats_1030_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/fawikedeneti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 5228 bytes
SHA-256: f1da7a79842a85728dabb8d72a8fc1da0efe0cf392afda880e092879b43c419f
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10488 bytes
SHA-256: 5857e5f35bf23d66e1e1d984e351f9bd9e46e900f9caff824a326feddf03e1da
font_02_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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