Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5445d2e350ebf…

MALICIOUS

PDF

78.1 KB Created: 2021-06-06 03:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c92f05a954627d2c453f3f322b97504c SHA-1: 462b963eecc4ba5d033c7ff985f1542ed9c19e18 SHA-256: 52d5445d2e350ebf795dbf2b2f6e5d82f84dc63d266fd658b7ffbbd5d93cb55a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The primary URL, 'https://drafthe.ru/pbw?utm_term=things+to+say+instead+of+best+of+luck', suggests a lure to a potentially malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/pbw?utm_term=things+to+say+instead+of+best+of+luck PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388428/normal_6001411592719.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/42884cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_6060dee520e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5fd15a9dbc0c5.pdfIn PDF document text
    • https://pipawini.weebly.com/uploads/1/3/4/8/134888109/63a30780700.pdfIn PDF document text
    • https://figejarorosuwe.weebly.com/uploads/1/3/4/4/134433037/lanuxopewogifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_605311ee3b98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5fe995200f4d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fff77ee985f5.pdfIn PDF document text
    • https://zitakafe.weebly.com/uploads/1/3/4/5/134587302/lowowewerav-jiramizovudu-dojitudi.pdfIn PDF document text
    • https://fexifetonazez.weebly.com/uploads/1/3/4/4/134492485/xereru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_60bb4e3fb9803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_60069bb367c52.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/3238872.pdfIn PDF document text
    • https://pujatafar.weebly.com/uploads/1/3/4/8/134854232/6115306.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/decb02f3-e261-4a62-b21e-4e847feecf22/xavetererew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47be82f7-c7cc-42af-b7b4-81500d05c728/wupax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f744fd-8220-45a0-87f6-6602307ea09d/medasakejiketubazefid.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/f/how_much_is_18_karat_white_gold_worth_per_carat.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144688929/what_is_the_main_difference_between_hardware_and_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc56e551-52ae-4667-8a18-69e3f7e20cf5/99772544354.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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5440 bytes
SHA-256: 1b5d959fd442acb61ef5d05422477bc8265d1571e3f0f77578f4a41ef44f17de
font_01_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 11548 bytes
SHA-256: ff98b8cf6d2646fb597a871bb921534f971e874928892f4530ad5c15ddb51711