Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41f79879004f940…

MALICIOUS

PDF

83.9 KB Created: 2021-06-12 23:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 330fc87485463b5c7ff42d570387dd91 SHA-1: d0ccc309ffa2d16e36c7c850f2177776d371161a SHA-256: f41f79879004f940ba575f371faa91fec0cbb6ee09095fcd599e1546db0ee846
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 0.9996

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://crewmak.ru/pbw?utm_term=rising+and+falling+intonation+exercises+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_601afec85fdd5.pdfIn PDF document text
    • https://rativebexatu.weebly.com/uploads/1/3/2/3/132302992/4133065.pdfIn PDF document text
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/8e49ed747210f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fdd8b0e01bc2.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/kewok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450345/normal_5fdeef1023ebf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4472793/normal_60afe2bd118a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366625/normal_5fcd6ec17624b.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/2964207.pdfIn PDF document text
    • https://mepopuwiv.weebly.com/uploads/1/3/4/4/134499337/kafebeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_603bc7add0c0b.pdfIn PDF document text
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/5523398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5fedee39a98c7.pdfIn PDF document text
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/xovem-xekobuza-tomame.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/233b4df1-a991-4453-be3b-d3c37c05a4b7/26717841637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb2395d-c17b-4437-9ace-ce55a54658d2/54451113979.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144568962/ielts_gt_writing_task_1_samples.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144454161/what_to_say_to_my_parents_on_their_anniversary.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 3152 bytes
SHA-256: 9c72de4b9d664051f945d081314e4c095f05e568e4b3f29b8c770443b0e30c37
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5584 bytes
SHA-256: d24b2a4b41a0f92583c3e366aaf3ca80d1b4e918ebbc393ea1588a8af02d33d2
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 10944 bytes
SHA-256: 1f089ae668d6fff36696c998c66f1712d486373523e4d25af3bd58fd995f03db
font_03_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 16132 bytes
SHA-256: 509934cdbb9683f419942e1124af0383917c78d453715be25cfd12d3786bc920

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