Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfed83687e2a2e71…

MALICIOUS

PDF

67.5 KB Created: 2020-11-10 08:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: c1becbd5001f54a93061eed31d409b0d SHA-1: cb4bb2120d69832e1ba6cd6de2d9a6d2d4d3b8bd SHA-256: bfed83687e2a2e711c6a024ee2a38f56ab2544a78fb9eeec5033fce0a6d2bd31
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • 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://traffking.ru/strik?keyword=pebble+apk+download In PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5004881168e06.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/9471464.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/4b100eef17e9ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f9aaa7044b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5fa6ed52231ce.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/gupuso/dawup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5cb42b-d16d-4bc8-a7c3-762e82d3bb74/mensa_iq_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/83902417510.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/68308723268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d1c271-4286-4981-a714-a5a9c817e856/51701299567.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/the_letter_b_worksheet_for_preschool_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af077027-41cd-402e-9ad7-bf2b5080efdc/desezifurodajaxolezi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/login_windows_live_hotmail_sign_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1fa19b-911f-4910-91aa-9359f0ca804c/80744384980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ac1365-78b4-4af1-9128-5f63dd018959/viregadadagexiluwovinux.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_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 4976 bytes
SHA-256: 976d6e06eda833bb67c7b7da6acd55b4ff972c3e84d6553afd54790a7ee281a9
font_01_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10916 bytes
SHA-256: dc2d97a3aa6a2d6e8d2a4803d0aca7d20a348c0c9289839e1fdf170f3586f7dd