Malicious PDF — malware analysis report

Static analysis result for SHA-256 648163bf91cc2a7f…

MALICIOUS

PDF

78.3 KB Created: 2020-12-28 10:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c8e059a13cb9a7dbca5d0c0bfac21d3a SHA-1: 51781f4020c47a47520bc49fe9932c1d2d1fa7b4 SHA-256: 648163bf91cc2a7f9077fb2b42a2dbb19bd63a55cc900987582b037c3e5984ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous external links, a characteristic of link farm or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=the+middle+ages+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/pupevadojas/gfScwx1/lock_screen_wallpapers_iphone_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fc82d88c8bd4.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/iiPhgid/85412475723.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/GiigijS/first_strike_valorant_tournament_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/wgghhgj/superbike_racing_calendar_2019.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/zoropeke.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/RQeyicT/dalepuvefofuxenepin.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/hc8AibY/pikovukanozotezidi.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/hhhfifQ/learn_thai_alphabet_for_beginners.pdfIn PDF document text
    • https://zovijewef.weebly.com/uploads/1/3/4/4/134400079/zozemonakumuxota.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/ggdIhjS/pixelmon_mod_apk_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/igedDja/12266300769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3959e613-a111-49dd-9259-099b06abd211/best_erasable_pen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5596d5-00e9-4765-8bf2-ab663f0ac42a/mumubarutukuroverunebepaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/278cf942-50a6-479f-8475-64e5b466202a/wefosinatixiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039da550-5f46-4675-9e29-bf17ce82b561/cartoon_pictures_of_mario_and_luigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48347f3-b30c-4599-8058-186a2ae54b27/healthy_sleep_habits_happy_child_by_dr._marc_weissbluth.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 5132 bytes
SHA-256: 4aee604fdf6974000813636a84d5ffa72f27e285beb24b810b4abad0420498be
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10864 bytes
SHA-256: 748e6f409db85d9602ce025b30e01bf1153b31871e4b1bc0825936a0c539898d
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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