Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5819f99fb0ef349…

MALICIOUS

PDF

95.4 KB Created: 2020-12-15 14:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39ff928645086d1db4586d3cb011291e SHA-1: 6d1325dff5c119576e475cff52da7d1536a9995d SHA-256: d5819f99fb0ef349e68125512d03aeea3765bdeda7f5d6c41593b49d939fce9b
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 0.9991

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
  • 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://traffine.ru/strik?utm_term=ruff+and+reddy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fad959221a49.pdfIn PDF document text
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/sowodafevidugal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fa774cb7292f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fcc3e38beed7.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/39fa973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fd7b8379242d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fb475e71c10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fd62c6062663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fc65700b7d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fa741c6d7d1a.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.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/wapunekebaxireku.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/bd_air_force_job_circular_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182e281d-a9d1-42e4-a4c5-c2f123a76949/79256882624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a6cc5e-416c-4ec6-b3c4-2ffb2ac9bbd2/the_poet_by_emerson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304bacbc-59d0-45a6-8d31-15dec4c0e5f9/73412309393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de25007-0957-460b-b595-a3fc97f7c122/9943056839.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014724.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14724 17436 bytes
SHA-256: 77e4053477917eae1e209ca09821562a93cfe5ede46d718fed65661e7dc43294
font_00_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 2920 bytes
SHA-256: a986119c16e44081cc8e25afede66da4c613bf9b2bda1169c6dfb8b692a7cff1
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 4444 bytes
SHA-256: 317e51d48a68f7b95313d1a0918659e5bc933d48911334684c06ec2e92b160db
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 2780 bytes
SHA-256: 5f543cb2adfb67460cf5d72760aedbaa0e063cb70c08c5f22653575af7846ff7
font_03_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 14132 bytes
SHA-256: fa17173f10b09a21de82398b9c793df66314b5af808c9b0aeb640ddb1f4a615f
font_05_sfnt_off00016144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16144 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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