Malicious PDF — malware analysis report

Static analysis result for SHA-256 7218e53c4337ff1f…

MALICIOUS

PDF

72.3 KB Created: 2021-04-03 18:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ede0262abd726f4e98a1f12b4835dd4f SHA-1: c65e55669debf20c4d6bc09e611f25770220768b SHA-256: 7218e53c4337ff1f8ef5874622822cdf4bee292367bdfd992d4a920c4aed98c1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the nature of the link farm suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=line+segment+ray+line+point+worksheet PDF link annotation
    • https://zowamuzifam.weebly.com/uploads/1/3/1/1/131163536/1235927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60252ee92078e.pdfIn PDF document text
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/xejele.pdfIn PDF document text
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/83c6950660.pdfIn PDF document text
    • https://guxilidokuwog.weebly.com/uploads/1/3/0/7/130738661/jobak_piwuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_603b78df95b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_605ae2782c7ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_601003201ce0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_60347dc19670f.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/fb1a48aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sopugagavot.epizy.com/guxelazasuzikomiwog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0eef98-ce86-4a26-bfce-982e34d44f65/80692455241.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_d93a9b2bdcf44b9cb95f74c40c3b18e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1f24e6-ed17-4e53-b967-a6ac712b85ae/24937812842.pdfIn PDF document text
    • http://muziwuxakujaxa.rf.gd/83285502041.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_03f0d5845de941f7be58b4d8d4abf48c.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_8862402cab0c475ba5fb1e7b99d74ec6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5001284-dc01-4e83-b727-bef6ee722cc0/didapiwomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f00c56-9218-436f-af37-64550b8a8f28/69505605411.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_b96ddec96543463798631cdc1a9edb41.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_abed213ca443450ebdf42c9e4fa04f76.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_dcc795f83258475281fe38113f0ee3a6.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_a3bf31f3acaa4ed3b32047ae730658d2.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_e24be842d9d043d58fb8b3dd8f216ad5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c849ac-65e5-49e4-8b07-4e54a5303453/what_is_the_main_theme_of_the_book_of_daniel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 5432 bytes
SHA-256: 6f9c89ba27b165c215893d1f264d77f7ffbfdba28ebf91dad61ef904205c6872
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 10600 bytes
SHA-256: 3bc9e8e84248972f7eeec3f1a68ff66dacb71aff57b894666e321e3954586d8a

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