Malicious PDF — malware analysis report

Static analysis result for SHA-256 b123cc5b14213484…

MALICIOUS

PDF

78.9 KB Created: 2021-03-31 02:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 906a9ffd230bbc5ccab0b5a97ed7a522 SHA-1: 5848b76dda6b15d1e32d1747756d92125e23898d SHA-256: b123cc5b14213484101cbaae002e41072c55e7f987cb6967ef0e717646c2cf55
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/award?keyword=writing+algebraic+equations+worksheet+pdf PDF link annotation
    • http://pobesegu.scienceontheweb.net/bell_palsy_treatment_exercises.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/86453316799.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/reading_verb_to_be_simple_present.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/gelVojc/slots_pharaoh_s_journey_unlimited_money.pdfIn PDF document text
    • http://gijasigekafafuz.iblogger.org/low_back_stabilization_exercises.pdfIn PDF document text
    • http://pemegira.22web.org/giset.pdfIn PDF document text
    • https://cdn.sqhk.co/kopakezoxek/uhcgc1U/91758051812.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/tactics_for_listening_third_edition_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_5c4d750bcd014f64850cf2da4b92f841.pdf?index=trueIn PDF document text
    • http://sikitoda.rf.gd/la_crosse_mood_light_alarm_clock_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/maytag_bravos_xl_parts_manual.pdfIn PDF document text
    • http://jegerusomeku.epizy.com/28413233499.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/39150331828.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/1994_honda_accord_codes.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_e1ae829293604f9db1afee5e67a1d551.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_777332157a9d4733889a2713e56010c7.pdf?index=trueIn PDF document text
    • http://woxebolinos.rf.gd/dewalt_735_planer_repair_manual.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_50dc42465fb44a57b8d1fc4b924be849.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_d9b164aab25c41eda6d82e9cb28db08f.pdf?index=trueIn PDF document text
    • http://desabukil.epizy.com/cacti_and_succulents_for_cold_climates.pdfIn PDF document text
    • http://rozepon.rf.gd/baby_crying_music.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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5852 bytes
SHA-256: 642c18c626eadfd27e1e020d62bcff1549798f85870666f46e6f74f8f6d0cea7
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10988 bytes
SHA-256: 9b36611766ae2ae55a96db59fb188aaaed9e39dd2939b53633054e0e31c1f03f

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