Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1562200bbeff0f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 23:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6bd0911b4d6a9917751f3428b9109c26 SHA-1: ba75e60d0534453807123d0a8dde1a00bbacfde8 SHA-256: 4b1562200bbeff0fa39155af68d455ddd6322d504ca282bc783ec59b26539a11
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm designed to mimic search results for 'school supplies for 5th graders 2019'. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest the primary goal is to redirect the user to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=school+supplies+for+5th+graders+2019 PDF link annotation
    • http://xiwotafajiloluf.22web.org/58463779552.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/97313474500.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/ibgejim/wav_message_alert_tones_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fe6dad913350.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/hhghji6/xenasamaxewobutetikiwik.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/gdhhihw/world_war_2_end_date_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/jjhNJdY/idle_coffee_corp_game_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/clMqigP/doreloxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fd61360c70dd.pdfIn PDF document text
    • http://joxepubevi.22web.org/58809423833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ffd2068b03e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobisojew.epizy.com/acet_reviewer_2019.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_f31ff11848fd4111a6b7b949a9c89880.pdf?index=trueIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_9a861524db85434c88c41b385dd39c96.pdf?index=trueIn PDF document text
    • http://vimevuda.rf.gd/analog_clock_app_for_android_free.pdfIn PDF document text
    • http://wufofot.rf.gd/bugosavusozekefubu.pdfIn PDF document text
    • http://gatokelemek.rf.gd/how_much_money_do_foster_parents_make_in_florida.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_126f09e630b6426dbd1c876a75d53c32.pdf?index=trueIn PDF document text
    • http://tuganireriwem.rf.gd/zekiwelozedezamuzojo.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_7c33594ee11a409f9682c1cd2a541ac0.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_bcf90f952a504c2496abf84518188ecc.pdf?index=trueIn PDF document text
    • http://rixuweba.rf.gd/wimijukibu.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 6124 bytes
SHA-256: fd35beed75d72bdb13388e2267508acfd98bbcfe25c9ccf531fc7e8ebd949ca0
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 10232 bytes
SHA-256: 3c2c3c61cbadf241e79042b9fe00c4f25335596ceeca6a2aa54aad45e6340962

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