Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9ed4f82103ca81…

MALICIOUS

PDF

91.8 KB Created: 2021-03-17 18:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef009fdaed9179831933da40cd85fa6 SHA-1: 227356a06aee4fb94a0141ddda72a9e89a8b0074 SHA-256: 5c9ed4f82103ca818cfdf512af49fca7d75030a0a6572fa49d81cb6f463442b5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of external URLs and the nature of the heuristics point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=amphitryon+38+pdf
    • http://fb-pageunderreview.com/82240082572d8cv2.pdf
    • http://istlan.space/vans_old_skool_white_leather_black_stripexe2y6.pdf
    • http://dirtygirl.fun/how_many_calories_in_a_medium_grape_slush_from_sonic1jhll.pdf
    • http://volosaty100.xyz/25770032599f5emf.pdf
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/49b978890f75.pdf
    • https://paninopuj.weebly.com/uploads/1/3/0/7/130739529/6243766.pdf
    • http://qrastenmap.online/multivariate_analysis_logistic_regression_spss7yrdr.pdf
    • http://autokenn.com/isrotel_beresheet_spar196n.pdf
    • http://gimepar.22web.org/bootstrap_form_validation_multiple_messages.pdf
    • http://confirmationhelpcenter.com/wahl_clipper_corporation_addresslx6k1.pdf
    • http://roman-holidays.shop/14089465239yq4hm.pdf
    • http://satofaxa.iblogger.org/votetejop.pdf
    • http://copyright-infringement.business/nubifakexebefudevikplue.pdf
    • http://idealslimitalia-official.site/woraxinigetalaugvw5.pdf
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/1b6ab2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sawezigulafufa.epizy.com/uc_browser_android_2._3._6.pdf
    • https://s3.amazonaws.com/wizidimawag/vebuwejezupidopodeliximem.pdf
    • https://s3.amazonaws.com/piwanisaj/street_fighter_4_arena_mod_apk.pdf
    • https://s3.amazonaws.com/solonebosop/giluzidapikepen.pdf
    • https://s3.amazonaws.com/penefelomiju/59653687853.pdf
    • http://tarefipiv.rf.gd/cnbc_tv_news_in_indian_stock_market_updates.pdf
    • https://s3.amazonaws.com/gurowozenupifi/jomexewuxibozepokamamagu.pdf
    • https://s3.amazonaws.com/nunakixuma/static_ignition_timing.pdf
    • https://s3.amazonaws.com/pasutiz/62863818050.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013091.bin
cea88aca42063d8324ab4cbb65f35ed231313e239ff310ff51807c77157131a8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13091 20784 bytes
font_00_sfnt_off0000f822.bin
cba957ce6f6997ef6b17e0621c56c4990cca425398f938919269b1e64c09f969		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 4980 bytes
font_01_sfnt_off000108ec.bin
703a4e6f5049395fca9e1102f6aac67e67eeec85b77a39772e9c8ca590f8c9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 12520 bytes
font_03_sfnt_off00015364.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15364 4324 bytes

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