Malicious PDF — malware analysis report

Static analysis result for SHA-256 38935350eeb9d597…

MALICIOUS

PDF

77.1 KB Created: 2021-01-01 14:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 667114b48d5626816c1c4b90a0367ae2 SHA-1: 95ecd1edb088547e5db213e7671965d475805f01 SHA-256: 38935350eeb9d597986aa970ebeea5fdc587b8406e228a3c8b0f3a600f0e521e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to business costs, likely to entice clicks on the malicious links. The presence of numerous external PDF links also indicates a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://traffmen.ru/123?utm_term=cost+of+revenue+for+saas+company In PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fec00dac7969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fc420e74f3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5fb974ce0a3e2.pdfIn PDF document text
    • https://newowujosof.weebly.com/uploads/1/3/4/7/134759739/ziwibogisof.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/c21da13a-f50a-4c51-a155-97c4e94fa1de/java_concepts_early_objects_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6728481-c5d9-4ae5-9617-39f4956b9bfe/nirumemerobuxisugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1718d9b3-89c7-437d-88e1-4e4244caf61c/78379511355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3154d8-a742-436a-b5a8-ea9db1130378/58830473337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57e6f17-05fd-41df-b9d6-f3e21e8358b4/trumpet_music_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae495312-07fd-4eb4-a11b-5fe74a5b8472/tufikedivak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc58728-5430-45f6-93fd-2c37ad6a8e27/basevovap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd33086-e36c-4b45-8490-ed352fcd93d3/84777051941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5a4fc9-3378-4418-8081-073be0c8b23f/75452244933.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/chrome_for_apple_macbook.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5148 bytes
SHA-256: 6f46d8c5f731ffc03a0beefd63ab0428beb8b12e657526a87e051f4a39ac03d6
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10808 bytes
SHA-256: 520b69a013701b61838752d94ac2abf009e8dd03da78c4dab78c3dc8d79378f1
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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