Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b659c1fe3e4345f…

MALICIOUS

PDF

73.6 KB Created: 2020-12-13 23:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8604757d53280c37b192c0bd4f3d1f32 SHA-1: 1c679eb457decca77b94e24e024fa40adaf9a725 SHA-256: 6b659c1fe3e4345ff6fd636de58fd85a236c16fb1102941bc2046ab52f191440
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, pointing to a suspicious URL (https://trafficel.ru/strik?utm_term=trader+joe%2527s+denver+colorado). The document body, though heavily obfuscated, contains text related to 'Trader Joe's Denver Colorado' and the authoring application 'wkhtmltopdf', suggesting a lure. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=trader+joe%2527s+denver+colorado
    • https://vagomonezupu.weebly.com/uploads/1/3/4/4/134403629/459471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b9b49764-06dc-43b1-b587-1a383a0272e3/8433819869.pdf
    • https://static1.squarespace.com/static/5fc006d0104edf1d777bfbd4/t/5fc9d7e7196a600d3c337eb0/1607063527184/fast_food_restaurants_open_near_me_late.pdf
    • https://uploads.strikinglycdn.com/files/6c1954f5-1c14-46d0-ad74-1583e9f34583/12577898.pdf
    • https://uploads.strikinglycdn.com/files/88c16731-4adc-443d-a9ce-2a26128a596f/78687181044.pdf
    • https://uploads.strikinglycdn.com/files/75f7f468-ebfe-4ff3-99a3-43f7b71079e2/kufipunawamusiduvaja.pdf
    • https://static1.squarespace.com/static/5fc78f50e9133927d90f8a19/t/5fd0b1aaa94600575883df7a/1607512491281/fumiwi.pdf
    • https://uploads.strikinglycdn.com/files/34023a07-1617-444a-9362-18248f8e2ffc/82245855768.pdf
    • https://uploads.strikinglycdn.com/files/360b79a8-e724-441c-8f8d-b45cc9b396f9/pathfinder_mounted_combat_paladin.pdf
    • https://uploads.strikinglycdn.com/files/9dbb2f05-91b1-4f0b-8ef4-66f26d36b001/minecraft_saklamba_server_ip_1.8_t.pdf
    • https://s3.amazonaws.com/forupokisip/tavedufirok.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_off0000d444.bin
f2e7bb6baf7a89fa7325f56e7c87ed92162cfa358f4507d6252fa7364acf5495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 4712 bytes
font_01_sfnt_off0000e459.bin
b2e5aebd0820e400a19450b0ef4a7d99e40549e95eca55ab80c13085e8b28d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 11268 bytes
font_02_sfnt_off00010aff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 4324 bytes

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