Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf31bd21397b380…

MALICIOUS

PDF

87.3 KB Created: 2021-03-17 01:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 012e8899ab4d00aa7470fa31c35702b0 SHA-1: efd22edf0afe53e1eb636b9c8873ef445d57952b SHA-256: dcf31bd21397b3803f4563389c856499984c5446454c61a09e54276575598367
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially malicious or deceptive content, likely as part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/123?utm_term=burlesque+movie+soundtrack+free PDF link annotation
    • http://jenoxatefogejo.22web.org/sadabonejuwiv.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/fjaghmH/instagram_profile_downloader_chrome.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/bnmhjBI/menowubugabarekidebavix.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/kulanewisigimoraxowek.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/gfsIhaX/snapchat_icon_black_png.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/fNQifZx/magic_piano_tiles_3_ad.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/UTHxLij/free_woodworking_plans_piano_bench.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/oid19jf/lokefuvan.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/9918524209.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/46948336203.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/aicOErq/traffic_bike_ride_2019_date.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/gcWgdge/age_of_apes_mod_apk_latest_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_09adfd9ea8794fca82a51cd4f9a91f25.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_7feb7fffdaf9406e9b1b0cdfe5802676.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_4bbd6a2a16764c51ba435d965ebc3d4e.pdf?index=trueIn PDF document text
    • http://nijarigu.onlinewebshop.net/51760563549.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_30a85af624964ad286bd977111380702.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/chakra_awakening_book.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_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 5464 bytes
SHA-256: d09260afe61a990b807e85f9847fee1135b0d4cb8c7d0c009cf48dca0e50f421
font_01_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 11516 bytes
SHA-256: a11a3914be9f2c3535653d351508532da9377ff98624923176d4e64d06123a47

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