Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e737ef8dd9213e…

MALICIOUS

PDF

99.6 KB Created: 2020-11-09 20:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3f697ed99f66532bb175c2ce043b019a SHA-1: d004eacb9ff1ebf51530c09ec0139422744e6293 SHA-256: 91e737ef8dd9213e0480bc20923be4b247fd05ac8def214b679e9f0e9218ab63
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors, suggesting a phishing or content-scraping lure. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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.
  • 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?keyword=ceramic+egg+cooker+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f8db537d0595.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/18821265440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f884769a1ad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f9a17e4b590f.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/muraxibu.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/21391188148.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/374977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5f9b1d8c3f649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f912048bad2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b4c300-faac-47eb-a4c8-0265440e8822/kemukigaberogov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05949530-fb57-4132-b661-ecc8c2a0f1d5/sozubejefaranapamitusevuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef91b137-183a-4a10-a43b-afa3d56c8d59/759090786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a96c57-3ac7-4bdf-b38a-1ac4875a41bf/benogaxez.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00015605.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15605 18128 bytes
SHA-256: 6449f67896784ff96096aba6830263cf5f3424ce7326793a43e54e2e49b7ed85
font_00_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 7028 bytes
SHA-256: 36e24c356853a16985b4761866258f6f73d1b69c92ba6a652646d93593a5a989
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5012 bytes
SHA-256: 2e326a31e65994ae2b1bf2a492f2a12e243d359541c711c9dc0dc7d1b45e7a59
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 2656 bytes
SHA-256: ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c
font_03_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_04_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 2108 bytes
SHA-256: 5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52
font_05_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 6640 bytes
SHA-256: 593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6
font_06_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 14372 bytes
SHA-256: ccb6f5b44510fa4e53d2fedbd3a53242643e72d99392bfdf5c24dcfc3d1cfcb8
font_08_sfnt_off00017244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17244 3276 bytes
SHA-256: 36e71c95d3b6602ce175a98ac99a2c18c99235fab0e24c6c46ec4ff9e72f8c94

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