Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750e43dc0f43316…

MALICIOUS

PDF

78.0 KB Created: 2021-01-01 23:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0800daf4239f5cecbdbf2c7167579afa SHA-1: c25987a6887ac6f926145c33ed98c15a9497a108 SHA-256: f750e43dc0f43316b9fdd87d535c9bc00f2021239820425049991410b2efb188
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, including one that appears to be a redirector for SEO purposes. The document body, though heavily obfuscated, contains keywords related to dryer troubleshooting, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://traffset.ru/123?utm_term=maytag+5000+series+dryer+with+steam+troubleshooting PDF link annotation
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/59b860df8476.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/6676203.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/2177400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fb6b3b26b0e0.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/jhxhdgd/65727412372.pdfIn PDF document text
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/6409802.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/1630653.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/vefuzudawinabotad.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/susiwemibabedovem.pdfIn PDF document text
    • https://wewejodoje.weebly.com/uploads/1/3/4/6/134685686/715cd6d579719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f942b848c49c.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/exibXsR/rainbow_ice_cream_unicorn_party_food_maker.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/sovikiwupifibojavov.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/3je7ZiI/true_football_3_patch.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://uploads.strikinglycdn.com/files/310e5fc0-f6e8-4f96-8700-adad50ad8114/pirates_of_caribbean_2_full_movie.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5728 bytes
SHA-256: fcee489b9fa89009fdfda3bee84553cdaf73ee1ccf79db7eb2b5d24024341c08
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11048 bytes
SHA-256: c99b4595f1234e36c19d0990296b92c5c0e0ec40fc1056f901f684a283be3da3
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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