Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eef18288a7292b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 14:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f0b858f9a84303e104c4d535f3134993 SHA-1: 2a565c84282cd51a7edc9465bf8831daa43d03ae SHA-256: 90eef18288a7292bfaabe142a6ae69deaf71d1125d8269594d2c5a73d2ea839b
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to 'counting down from 20 worksheets'. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=counting+down+from+20+worksheets PDF link annotation
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/8b32a6b02.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/search_name_in_voter_list_up.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/iaTgiih/tofijiduvu.pdfIn PDF document text
    • http://smirno.life/58691524604he7q0.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ifEi6mZ/sotepuxisuko.pdfIn PDF document text
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/4216ed88bed.pdfIn PDF document text
    • http://italy-small.space/basler_pylon_4g3vwc.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/lagexorc3bwj.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/igiijic/9300977324.pdfIn PDF document text
    • http://bawukafivawi.iblogger.org/14792890698.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/igYdslU/76422830287.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/barangay_hall_floor_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/hYhijhu/furia_de_titanes_temporada_3_capitulo_9.pdfIn PDF document text
    • http://jegepev.22web.org/ancient_history_quiz.pdfIn PDF document text
    • http://cosmicgig.com/intex_saltwater_pool_pump_cs8110_manualpvbin.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/69500ebf9b.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/xezedezoxokezur.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/xukowo.pdfIn PDF document text
    • https://sibabaku.weebly.com/uploads/1/3/0/7/130739132/9120660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxuvoluzoz.epizy.com/bleep_test_police.pdfIn PDF document text
    • http://sewexojin.rf.gd/which_companies_are_on_the_sp_500.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/3489413582.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/53653384281.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/81841107707.pdfIn PDF document text
    • http://vubepet.epizy.com/secret_life_of_bees_movie_short_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/chupana_bhi_nahi_aata_flute_ringtone.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_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 5416 bytes
SHA-256: 5d398cfd3189ff67155955e4007fdcdacab6f88ed272c04df2dd594b4eabc6f8
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 11348 bytes
SHA-256: dd8d4651cb6c396de80f3b6b38874c29e03012d6e0f38b56bde424113639764f

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