Malicious PDF — malware analysis report

Static analysis result for SHA-256 7856592e5bd9d663…

MALICIOUS

PDF

78.1 KB Created: 2021-04-18 20:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e44320dd408e3768747f54cf5a9bf22b SHA-1: 7f3aa3ed7dcc2a66484ffa7ed26fd6a41d5f55bd SHA-256: 7856592e5bd9d663229f8a5638d4563a689bba4f6b3609cab5f55453dfb272b1
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'Ti-84 calculator app for chromebook' and embeds multiple external links, one of which points to a suspicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://xezojetit.ru/strik?utm_term=ti-84+calculator+app+for+chromebook
    • http://ashotik.space/komogc6gey.pdf
    • https://cdn.sqhk.co/wesaduleb/bEdhecj/silvercloud_byu_login.pdf
    • https://cdn.sqhk.co/pawapoma/igZsVOG/huey_lewis_and_the_news_american_psycho_quote.pdf
    • https://cdn-cms.f-static.net/uploads/4378845/normal_605d833644e37.pdf
    • https://cdn.sqhk.co/tinipuded/dhejdhc/island_survival_winter_story_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4458635/normal_60687ec49e15b.pdf
    • https://cdn.sqhk.co/bemememu/411gcz7/shogun_assassin_movie_list.pdf
    • https://cdn.sqhk.co/sefibenip/coigSCz/comics_kingdom_sally_forth.pdf
    • https://cdn.sqhk.co/xamitarerivu/itOAW89/wobirelaza.pdf
    • https://cdn-cms.f-static.net/uploads/4489058/normal_603c042f2bb36.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd13af344c44.pdf
    • http://yewes.space/bromic_under_bench_fridge_manual5zjjf.pdf
    • https://cdn.sqhk.co/dibitarebizu/sQje8ia/76457154842.pdf
    • https://static.s123-cdn-static.com/uploads/4417815/normal_5fdcef0e637b5.pdf
    • https://cdn.sqhk.co/rijunawep/99o49g2/60114253422.pdf
    • http://boxberry-24.cc/modine_hot_dawg_installation_manualnnwtr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_e6682ccfd53b4a8d9e77b7bdf548ffc0.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/rotimokujanoxotikoz.pdf
    • https://s3.amazonaws.com/zobuwubedak/12715521965.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_44e88b1961e64db885f8e1579b6f51e0.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_147e7b0934ce48de9c7b2242e1ed2d71.pdf?index=true
    • https://s3.amazonaws.com/luxaduzimase/bejop.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_8f12be8003f4410b83996d59ff6b0004.pdf?index=true
    • https://s3.amazonaws.com/tixedujegibex/gozazokonotoka.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_c6c5bac82ba3407a975c44033d78ddf7.pdf?index=true
    • https://s3.amazonaws.com/vukujidor/gerixeninagakukere.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefd.bin
6b2297b6d683a04963fda7407d4ae51da73463cdb505d5d98ae8b511a524f060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 5320 bytes
font_01_sfnt_off0000e11b.bin
de0227cd5f2632f0cfe5c2a0b724bfe967b9ae20dd5df9121bea42af47ad0406		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10904 bytes
font_02_sfnt_off000105eb.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 16060 bytes
font_03_sfnt_off00011a83.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 4324 bytes

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