Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a958b6e786233c7…

MALICIOUS

PDF

69.8 KB Created: 2020-12-15 21:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9da408dba5718b46abc2cdfa506030c SHA-1: 5c81887d9e72783c210298e922a3c33e1bfac629 SHA-256: 5a958b6e786233c7e2a40a3e64dadbf316b7ba32d180d4eb44e05a95dc09a5b2
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a redirector link to known malicious infrastructure. The embedded URL, https://gettraff.ru/123?utm_term=walgreens+thermometer+manual, is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the nature of the link suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://gettraff.ru/123?utm_term=walgreens+thermometer+manual
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/vares_jatiguwem_nuwukare.pdf
    • https://bolusawowena.weebly.com/uploads/1/3/4/8/134894851/8752605.pdf
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/b535fac1.pdf
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/piledaxator.pdf
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/rodaletojo.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/30fede.pdf
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/moduk_paxawukaxon_dewevef.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/6669891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe11d39b1ed03538a26981/1606291927491/home_depot_air_compressor_hose.pdf
    • https://s3.amazonaws.com/wuniku/combining_form_cephal_o_means.pdf
    • https://static1.squarespace.com/static/5fce1e1ecc0d2519aa9f598b/t/5fd11ef26dcbf415393f4642/1607540468036/ahlstrom_munksjo_rhinelander_jobs.pdf
    • https://s3.amazonaws.com/henghuili-files/kajaria_floor_tiles_price_list_2018.pdf
    • https://s3.amazonaws.com/wizedumi/kolesituzuguvivakazu.pdf
    • https://s3.amazonaws.com/sefiwegegagu/nirez.pdf
    • https://s3.amazonaws.com/zunaporam/xupazusofitidikimejasa.pdf
    • https://s3.amazonaws.com/vonusirukete/dirt_cheap_protocol_cancer.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_off0000d583.bin
1ef484d5bc6bbdde14d24368317a3d72738db1e2a49e65313ff8031f70bd886b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 5112 bytes
font_01_sfnt_off0000e6c3.bin
8b95b334c9e6577aaf3b1e029c0d5f5c8745b6b57eb47f9e1c61349ec926ebb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10380 bytes

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