Malicious PDF — malware analysis report

Static analysis result for SHA-256 20787c9578b0e706…

MALICIOUS

PDF

90.2 KB Created: 2020-12-23 16:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 508ce1a8de284b78a7fc9a310c648306 SHA-1: 24495588f4de09de8f509b0a3af95f4ca3af807a SHA-256: 20787c9578b0e7068e78628c91c782737c4bfe8b38216b37019f3182d5af974d
194 Risk Score

Malware Insights

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

The PDF file contains a link disguised as an offer for a free Amazon voucher, which directs to a known malicious redirector. This strongly suggests a phishing or scam attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=amazon+gutscheincode+versand+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9e882ab5ff4.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/tjcrieo/3d_live_photo_apk.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/lubobuxew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f976b30884a1.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/bgjhjia/number_counting_activities_for_toddlers.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/9862b3504bdb52c.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/3a22c89a-675b-43fd-86fe-95d92ee76084/skyrim_abandoned_shack_dog.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/disoporezotudigisowujunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76082320-aa9f-4d5d-bd3b-6e29115950ac/mivuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425a3011-2079-4d45-b961-98046701ee7a/no_deposit_casino_codes_december_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e15246-a6e4-41e2-a26f-595735dcb345/bigozojodimixaxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/32234619504.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/buy_used_balanced_body_reformer.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/ssbu_bowser_jr_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74454d79-d790-42ab-b2a9-8da51e016639/chinese_checkers_board.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/fix_blurry_pictures_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 5300 bytes
SHA-256: 7e0255094219708dc5adf3c4f1689f8c43decb18880d978f1e41b992eee6cf14
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 3808 bytes
SHA-256: 830587a7b5e43b558b8892ec15ab2ce482df47b78c657675c819d4bec862e8b0
font_03_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 11980 bytes
SHA-256: c8e70f4c00748a7d1f5b34f62ce39935ff607894eb4b50dcb94dba156c33c647
font_04_sfnt_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3