Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8529a6c7758fef…

MALICIOUS

PDF

102.7 KB Created: 2021-02-28 01:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1d869ef0afefe2620db9c694cdc51ef SHA-1: 8e4715c7ef0249803d081ca2b5c6a0d86a190db8 SHA-256: af8529a6c7758fef2305fb8c11e934c05bd74864f21c4e66db35d85a6ae67e00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large 'link farm' with 24 external links, many on disposable hosting and utilizing UTM parameters, strongly suggests a phishing or redirection scheme. The document body contains garbled text and metadata, further obscuring its true purpose but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=diamond+sutra+tibetan+text PDF link annotation
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/tabijaximowuf-pimesedabefeduz-bopap-rozukirivajirov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fc72e4342afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5fd3d120b2da5.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/f37bcfd5d5.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/jovupapekotoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fe7aa928a8b3.pdfIn PDF document text
    • http://wekeb.space/zebra_zp_450_ctp_manualt6ea7.pdfIn PDF document text
    • http://detonic-hypertonie.website/10714264026qin4w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd84ea8d8f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_602664ca199d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_60296d9412566.pdfIn PDF document text
    • http://grinallex.shop/color_cut_paste_worksheets_preschoolrbbvw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 4524 bytes
SHA-256: 1f07aeef31de4c9c556f4baf23a1fe49459d265f82ee14ba532854ded85732d5
font_01_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 5144 bytes
SHA-256: b9791c9bc53fe1a99c2de2c847e114c3c6380f0bbb0acf51cacf5c2019df19aa
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 16460 bytes
SHA-256: 71824684434bc265789af96813c238ec61876e40c3033616a7eb3a30837ce2d8
font_03_sfnt_off00015264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15264 14284 bytes
SHA-256: ba2faf94c9ecde734f4a5fc7b3b0b375535da06f7913cbf19a59007b044fe1bb
font_04_sfnt_off00017c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C89 4464 bytes
SHA-256: 307bd11a2f5427905a16764e6094f6b55ee2a5d993718b7d10f80ae5c37cfdf9

Open this report in the interactive analyzer, or submit your own file for analysis.