Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b20a41cad1493bf…

MALICIOUS

PDF

81.1 KB Created: 2020-11-19 12:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a95d02a13ae8c4bb8473782912c3c581 SHA-1: e54ff6ec39164189437e9673e601f715505018a7 SHA-256: 8b20a41cad1493bf970596a13a20c02c7ba53d4822310d85460b6f6c00b7e14b
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high ML score. The document body, though partially corrupted, suggests a lure for media downloads, which is consistent with the embedded URLs pointing to link farms and SEO redirectors. The primary attack pattern involves using a deceptive document to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=gulabi+aankhen+atif+aslam+mp3+download+320kbps In PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/gadonevovozegu.pdfIn PDF document text
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/78230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f9e163820882.pdfIn PDF document text
    • https://robitejipesiz.weebly.com/uploads/1/3/4/3/134375849/6321106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f88a8e444d8d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/aefb210dfc2a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fb5e1422f7cb.pdfIn PDF document text
    • https://tipezigixak.weebly.com/uploads/1/3/4/3/134339593/7e5d79c11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7022876b-bc5d-4ebc-b4b9-49fa61b551c3/descargar_project_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/didujujoxenuvik.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/66488223607.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/37118345163.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/sepofewowiwazupijopope.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 7752 bytes
SHA-256: 16d728d5a64bd19145cc2491219d8e30d2f2268c8fdd781bb637ec776b7e2bc7
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 5952 bytes
SHA-256: d0b7c893ac4f6ced97d58205094d0d35f6735a6e30199544b19d338a2eda6c75
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_03_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 10372 bytes
SHA-256: 5e8f33b92558e843a5b62a6c95cec3ee0349ea01be84ddeb3622e5cd28c2371f
font_04_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16076 bytes
SHA-256: 8e080451972fa98aa9e3536045215e62b9f74f9d761fc20c19baab760c38cae8

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