Malicious PDF — malware analysis report

Static analysis result for SHA-256 252d7bbd5a3a7bb4…

MALICIOUS

PDF

91.2 KB Created: 2021-03-22 18:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9fa98ada9f458d6e8bf4ea334e461de SHA-1: 9e4f75ddc6c9ba185ed119c0ab876098633a06eb SHA-256: 252d7bbd5a3a7bb4113609bbb3bfaf30000423dc79b8bfcb830c5c76f68aed5c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+to+prepare+for+ap+biology+exam+2020
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/zogosepigina.pdf
    • http://lomidal.mygamesonline.org/81359461938.pdf
    • http://makedctl.site/manhattan_tattoo_show_crossword_clue2pxck.pdf
    • http://goproits.com/degawibiwalaxokavarebozezxb1r.pdf
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fd04fb899041.pdf
    • http://optarfes.com/mekibufazujefatofaxuv79vdm.pdf
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5fe8a1ded719a.pdf
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5ff9097dd9b1d.pdf
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5feddd7c964fc.pdf
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/4971946.pdf
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/2c8f0b13496b392.pdf
    • http://tuzevijubozor.mywebcommunity.org/midowasojozo.pdf
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/tobozegiwe.pdf
    • http://simopuvoramawu.mywebcommunity.org/jaybird_x3_not_pairing_with_iphone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zafijukopa/5578378794.pdf
    • https://uploads.strikinglycdn.com/files/998461bb-6c17-4e50-a7b0-6446dedb87f8/64236103666.pdf
    • https://uploads.strikinglycdn.com/files/f930018d-5f6a-4f19-8d89-14deb1abe395/microbiology_salary_per_month_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/74179acd-b935-48d3-bbdc-684048854e01/70740897727.pdf
    • https://s3.amazonaws.com/kavalukato/juxitagijazu.pdf
    • https://uploads.strikinglycdn.com/files/5a6a308b-590a-42b6-89d5-3dd40992a02b/xomutojakon.pdf
    • https://s3.amazonaws.com/genijusemu/bidinumofuk.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/57058636604.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011916.bin
4e74bd93afdee3d55447229d329659d87ee6e7db6fd2911bbc4e59d3afdbb1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 5364 bytes
font_01_sfnt_off00012b68.bin
4d6c75ba905445138ccfe903e5490bced2c5cd65b1e67d99859805b5268ac097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 11144 bytes
font_02_sfnt_off0001514b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1514B 4324 bytes

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