Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e0c600e1802282…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 19:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9a3560a77449d31a0e6d53e3e9e33399 SHA-1: 265fbda95860a2c8742e15ed1657423f3d2da7f8 SHA-256: f8e0c600e180228255f9200365e60c191575c2e263d194829c48e954a23ab69c
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or spamming operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, along with a URL that appears to be a lure for 'Wells Fargo mobile deposit'. The presence of multiple external links and the ML/ClamAV detections strongly suggest this PDF is designed to redirect users to malicious sites.

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://botokaw.ru/aws?utm_term=how+to+incentivize+students+during+distance+learning PDF link annotation
    • https://cdn.sqhk.co/zoluxoni/f2jchej/wells_fargo_mobile_deposit_pending_time.pdfIn PDF document text
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/gazudup_fanimunobeta.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/jinupofawode.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/30845207151.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/pre_algebra_textbook_8th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/KzTMyjf/445957748.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/how_old_is_mr._darcy_supposed_to_be.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/giKSgf1/offline_poker_games_free.pdfIn PDF document text
    • http://punejew.mygamesonline.org/how_does_drinkwell_pet_fountain_work.pdfIn PDF document text
    • https://wolazana.weebly.com/uploads/1/3/0/7/130775510/9037682.pdfIn PDF document text
    • http://bakanoloxekiwub.iblogger.org/employment_agreement_australia_template.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/f070869.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/how_to_set_adt_time.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/66646156674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miganuvag.myartsonline.com/our_night_sky.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/how_to_make_your_own_philosophy_of_life.pdfIn PDF document text
    • http://lekozuni.epizy.com/free_agreement_template_between_two_parties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6b10a7-8c23-4345-bebd-8fc829e20d36/how_much_ram_in_s9_plus.pdfIn PDF document text
    • http://pofedeguw.rf.gd/wokonujemewanuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9ef4d6-60cd-4139-a768-68b34d143d14/2012_chevy_silverado_1500_extended_cab_for_sale.pdfIn PDF document text
    • http://sonisan.epizy.com/sikifekozelesobofipirod.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_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 5272 bytes
SHA-256: cabaade5c03adb7d4fc79c18a3b5973faa94dca077ad8098d696d0962724d89d
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 11192 bytes
SHA-256: e208e058c322f00d5827a859bee374be9be1f6a16811f5591da3d050244a56bb

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