Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82e07b2f7c953dc…

MALICIOUS

PDF

79.7 KB Created: 2021-04-09 21:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 449d846cdc979d43518f82af353aa317 SHA-1: 855c8baa14074986ebdb240d9505588b556f23c4 SHA-256: c82e07b2f7c953dc01fa0a1ca1d19068ded5d6336b16fb7db2f2b08ae562241d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=best+roald+dahl+quotes PDF link annotation
    • https://cdn.sqhk.co/xabiximakef/jhijcgh/bejeweled_blitz_free_download_full_game.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/37781fd50ab1.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/sapamuder.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/pojevodisijuk.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/natudajo-lodife.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/iGngikj/21602262420.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/chahehb/ninja_dash_game.pdfIn PDF document text
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/musenujazerowexifa.pdfIn PDF document text
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/07a0169.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hjsHfTL/wumobotizose.pdfIn PDF document text
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/409186.pdfIn PDF document text
    • https://gesurori.weebly.com/uploads/1/3/4/3/134353915/tofofefo.pdfIn PDF document text
    • https://pasobirumolok.weebly.com/uploads/1/3/5/3/135394389/ragazoxuwejugekolu.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/48599052188.pdfIn PDF document text
    • https://xexibuwowixuzu.weebly.com/uploads/1/3/4/4/134455615/xebazudonetuvew.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/rosiwazagowojigetow.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://s3.amazonaws.com/dutimajizowa/75746406252.pdfIn PDF document text
    • http://butomepa.rf.gd/cambridge_english_complete_key_for_schools.pdfIn PDF document text
    • http://pajoxewujovero.rf.gd/11690001123.pdfIn PDF document text
    • http://dazotejake.rf.gd/wusalewuzabun.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/80701943274.pdfIn PDF document text
    • http://gisoduriri.rf.gd/how_to_apply_for_state_id_in_hawaii.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/business_productivity.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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 4816 bytes
SHA-256: d11e3a17c4038d6e04f6ff93638d4947ec4d933e232760ff2b8ce1e436069e1e
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10628 bytes
SHA-256: d2411cf2ec426f2a396cf698627e5d045445bfad2978ae94a24a105c3c729e13
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333