Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a722672df82145…

MALICIOUS

PDF

77.9 KB Created: 2020-11-18 11:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9c939e5459f552dc083ae96b122b48c SHA-1: d5da1a71c0f538cac28c7a2ae3b0b444682bbf8d SHA-256: 69a722672df82145bd326af59ea9c72f36734cf6819fdd6841fb6b74fa42f521
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=candy+camera+pro+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5f999614d3a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5fa5fff213c83.pdfIn PDF document text
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/liter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5fa61a11df462.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/bde751f4.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/4447623.pdfIn PDF document text
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/figad_vebibufijitim_xapirot_zedimironob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f8a774b353de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f9216706bd47.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/9c75a303-cbb3-4ed8-b60f-bb1cbfdebb69/simple_interest_worksheet_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb930af-3dc6-43fc-9f69-9fcac43ade99/daoko_album_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830dbe47-a349-4f23-b9d9-90997a5623f3/buzobenepedu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bepigon.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A6F 19836 bytes
SHA-256: 59bf89fe2d1bb39bdffc0547702a170b4c6bb24ebd3b71e9435ffe0e345b4fff
font_00_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 5204 bytes
SHA-256: 190571bcb961a2f1ee1da53bf49032eac42050807e8fb39b01a191beadb3119a
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 11176 bytes
SHA-256: a5ba63c9bf7647f1f2dcb21b62b4d64dca55eb2820c02bdc89b476c96ef60a4c

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