Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdacc431cbed41a…

MALICIOUS

PDF

72.0 KB Created: 2021-04-06 05:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a813018d123d326b56d20d74e05e52 SHA-1: 501b052ecea54420b0327de3135915c426ed870a SHA-256: 7fdacc431cbed41a462d88f8520ac72e195d62fd23f7fc197b7abe0198a1732e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'resalured.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=crt+heart+failure+guidelines
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff0154eeb93e.pdf
    • https://cdn-cms.f-static.net/uploads/4463552/normal_603942d44d339.pdf
    • https://cdn-cms.f-static.net/uploads/4459025/normal_600f9edd2f3d3.pdf
    • http://tersq.fun/70234369950uf531.pdf
    • https://cdn-cms.f-static.net/uploads/4403959/normal_603f42c1393cb.pdf
    • http://clyb-wylcan3.space/nirigojicd2p9.pdf
    • https://cdn-cms.f-static.net/uploads/4393625/normal_60436210cb69b.pdf
    • https://cdn-cms.f-static.net/uploads/4408875/normal_601d133b23a3a.pdf
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6011b6ab7aa4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff85eb38-5e9a-48cd-ad87-22fce8911636/39385850932.pdf
    • https://s3.amazonaws.com/xiwevitox/93401982317.pdf
    • https://s3.amazonaws.com/norozovijalu/40600971817.pdf
    • https://s3.amazonaws.com/sajezife/piruborexujez.pdf
    • https://uploads.strikinglycdn.com/files/0f410a36-ed55-442b-871c-141829989289/how_to_replace_a_fios_battery.pdf
    • https://s3.amazonaws.com/didowugorokirug/44723417188.pdf
    • https://s3.amazonaws.com/tosego/lily_flowers_images_free.pdf
    • https://s3.amazonaws.com/lebaxa/xutekebefatovivibofa.pdf
    • https://uploads.strikinglycdn.com/files/b36c2526-1ae3-4b81-b713-404fd9a5235e/race_car_coloring_book.pdf
    • https://uploads.strikinglycdn.com/files/37e7c218-5607-42cf-af41-cbc645b6c870/nozagodemigot.pdf
    • https://s3.amazonaws.com/lupuvogotog/how_to_get_your_vinyl_to_stick_to_wood.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd61.bin
b2e050bbf8279cbcdd0545c8755dd9de48b1a35541b1be0688b40fc891b2a4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 5072 bytes
font_01_sfnt_off0000ee9c.bin
c4429a39e9e8279b6109000c4ea8cea5935b90d6a25f50a1b3b2368fc44a6bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10748 bytes