Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cd399bcbd2d19d…

MALICIOUS

PDF

82.6 KB Created: 2021-05-30 08:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a39aab82e8b2690dd9508089b89eb9e1 SHA-1: a01d1113125c24f926d8dd2884e7edd596c878d9 SHA-256: 77cd399bcbd2d19df46fd5686f4d4947ae6b9219304e246adcb0c2672b7c6f92
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=farm+clash+3d+hacked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380211/normal_601af6d8bbc78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5fcb51cd456f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_605d09acc3737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5ffa089742921.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/saxarejetaja.pdfIn PDF document text
    • https://nivenenururela.weebly.com/uploads/1/3/4/5/134585639/4273459.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/5854517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476443/normal_5fdef352db14f.pdfIn PDF document text
    • https://tazavujaxiruvo.weebly.com/uploads/1/3/4/7/134746990/wabuzan_tufawobi_kanuzevolupaziz.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/1830937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_601345e09edd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_605d8d819cbbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_5fdde8aa26d6c.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/2cbf3bcc05d0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/725b3a0a-2d58-44bd-9d9f-f6eee8054685/tighten_manual_eject_screw_ps4_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20998c5-0532-4c46-9466-9b3b8cd883fe/beretta_a300_outlander_semi-auto_shotgun_with_black_synthetic_stock_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fce389-2363-4587-9959-9e13756c6730/kezonawiwob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e8992c-b78f-4b86-8184-074dd191916a/tuwovaxale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc04abd-c8ce-485f-80ed-7236728d9262/music_of_the_night_piano_sheet_music_easy_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fb546f-d589-487d-b82f-d3e6d7b3420e/wow_demon_hunter_best_dps_build.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 5364 bytes
SHA-256: 59a28625bb7543e439991d0cae3a8bdce3e290095c811d47284480a463e9f627
font_02_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_03_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 11292 bytes
SHA-256: 1f0547c94637810884e1bf9b38794af09b0558a46f00ed724447671243921dd9

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