Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a6f48d01634976…

MALICIOUS

PDF

77.1 KB Created: 2021-04-12 12:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7e6a67c5e5a4f62f0b254fe7dd0c9499 SHA-1: dd143ae541157d3eb61b43d140aa4a24a5a523bf SHA-256: d8a6f48d01634976c5190334db084a06a87fb1592568f98b220c75471a83b183
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

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://mezovuduw.ru/strik?utm_term=how+to+pass+net+exam PDF link annotation
    • https://cdn.sqhk.co/fivuwunar/iEu05bm/josoxoluzu.pdfIn PDF document text
    • https://forexegazujolo.weebly.com/uploads/1/3/4/1/134108883/ziveg.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/mopedaturobemo.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/jhxhige/subway_train_rush_runner_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/aNerghD/ginotujoviwizeruzakipedo.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/rfKicLG/koditibubavizavipub.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/9340431.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/5ghjie9/talking_pretty_girlfriend_apk_mod.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/resadutojo.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/VhjanSH/country_music_awards_2020_host.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/jfCgcgj/hide_n_seek_song_download.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/gararub_fiwubasonu.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/Kjgyhgd/playhouse_lounge_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/gjNrKmk/zevep.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/140cffd93014.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/c2e864b7-b36c-4e18-93b7-29cf0fc1dc71/brother_pt-1280_p-touch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2ad42b-88c3-4cc9-9ae6-c79ef513c530/siwosulanikuzon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707df198-b04c-477c-87b2-a8fd1517580d/how_to_replace_an_electric_stove_top.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_ec9bf7ec4846410b8a89677027a9cbf2.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_92cb777200c94c1aa1dc2c66ab056cc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/422791ac-8dc3-4147-8025-2410acda34ed/fobugures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd8f23b-9b5d-437c-b137-1e10d6829bde/game_of_life_rules_2007_instructions.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 4960 bytes
SHA-256: 5b5cdde40b07ed8cc927537285919ba66d522a3f57dde0695e052f1de6218d7d
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 11016 bytes
SHA-256: 1d570b9621d1b6f8a84cf64cae2c6df4b6c11b9d1642c21c3e7983a6fbb00a70