Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e5505cac537f98…

MALICIOUS

PDF

83.8 KB Created: 2021-03-06 09:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cf9df68a9d06f76df89cb9eaec0cdd72 SHA-1: d27cd56571a533561bcdd4f98424932ed74b1b6f SHA-256: c3e5505cac537f98e2d4119a2476a1d7058315ca9e4b2454b7dbba37540ca7bf
176 Risk Score

Malware Insights

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

The PDF contains a malformed stream and a large number of external links, indicating a likely SEO manipulation or content hosting scheme. The primary external URI points to a suspicious domain, suggesting a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nipisod.ru/award?keyword=how+fast+does+honda+rebel+300+go PDF link annotation
    • https://cdn.sqhk.co/wuvitatutuv/ghfjfgf/zonane.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/ahchbjb/bobezakuzureme.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/ifc2hex/jataferisipe.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/fmsqicP/the_white_door_day_4_eglence.pdfIn PDF document text
    • https://cdn.sqhk.co/zebusukef/R4cy8eB/dad_you_nailed_it_hammer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixolose/canadian_food_guide_2017.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_050382ad1d014a339d9be0e965b6f7b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/vawezanubisumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87653e51-d0d8-4990-90ac-1fdf9afee64c/how_to_start_forex_trading_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/24568271433.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_5e2ce89f992c4e979e19a5c8292eb0ae.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_f39c71593bac42c6afc784ff672aeedc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozaponi/mental_health_app_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/betty_crockers_picture_cook_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/wunote.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/79050050631.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/ccproxy_youngzsoft_free.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_5f26ec1e2f64416f94254029eca55456.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa657fea-e170-4e2c-9885-bf557dc8cea6/how_to_install_samsung_dishwasher_brackets.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_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 5668 bytes
SHA-256: 97772de5906bb65a55045366bb9863ad2661a31b1a30d8a115c99f5defe85bc7
font_01_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10700 bytes
SHA-256: 258c4ed38d402f0087b3623926ed317560af7cc5c5e0e7888bf959d55ef0749d

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