Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9101292a64b9981…

MALICIOUS

PDF

74.5 KB Created: 2021-01-28 05:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e121d77505694bedb02e39fa60130659 SHA-1: 9987e60ac0a82352cc4bfd91e819e5ad05eba9b1 SHA-256: f9101292a64b9981ce8a717a0676710330733130978de38d202bc633265a5d43
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://trafftec.ru/wb?keyword=free%20fire%20tik%20tok%20video%20download%20telugu', appears to be a lure for search engine traffic. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a potential drive-by download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/wb?keyword=free%20fire%20tik%20tok%20video%20download%20telugu PDF link annotation
    • http://pravagims.net/jazixo71m06.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/tosivuk_vazapalolex_vixoso_wotaromexad.pdfIn PDF document text
    • http://kalavar.xyz/loveliest_of_trees_sheet_musiceyf0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_6003704f90dee.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/9d0fa95.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/givuru_fanoxi_dijevovuxeka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_60010b3216308.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/7462757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403947/normal_5fc69dd7df4b4.pdfIn PDF document text
    • http://dronextactical.xyz/rijirakea7dgb.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/212f08.pdfIn PDF document text
    • http://segwaywheelchair.ru/misujakogetbsyk4.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/1744891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_60118f798eeef.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/gogawalizamikijabe.pdfIn PDF document text
    • https://gojesewemuvi.weebly.com/uploads/1/3/2/6/132681304/tefozemarugedi_sonufuli_fawimijibeluw_lamavug.pdfIn PDF document text
    • http://rastet-malysh.ru/60s_70_80_90s_music_radio_hits7q0xn.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://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 4952 bytes
SHA-256: 9420a413de8c3948a565f65fcd5ced236e403220eb533b210bacb4367e06a01d
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 9444 bytes
SHA-256: 4e6344e19f718e4fc28f41af3371ddd471a7e4f15b8b047e27aa6a7f1b37e412
font_02_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10532 bytes
SHA-256: a1db3dc0c5c34694ccd8ee89449d2964432bf3d065c7672e3934c411ec60e96e
font_03_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c