Malicious PDF — malware analysis report

Static analysis result for SHA-256 e144a1a390a83ea9…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 02:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59a73efa9f89ed49009296ad311805e8 SHA-1: ced3357253f0c079c95b7b90f2701ded115784c6 SHA-256: e144a1a390a83ea92653dfdb5aa86fe4b6f110626f6978d1a91254bfcfd3ae60
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=density+of+pennies+lab+answers PDF link annotation
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/fotizinoderatux.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/histology_of_kidney.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/41230419263.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/c8744a549325f6.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/6f08ed6b27.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/detuvalub.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/windows_server_2012_r2_standard_iso_download.pdfIn PDF document text
    • https://pikulevixabokof.weebly.com/uploads/1/3/1/6/131606248/8312032.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/back_to_school_worksheets_for_kindergarten.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/656313.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/zikomakujabazizitupov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_d2d7cfe661a74a648910f578eb87ca06.pdf?index=trueIn PDF document text
    • http://xurosuforudev.atwebpages.com/lakoduze.pdfIn PDF document text
    • http://guseboses.atwebpages.com/67979198310.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/wujumilifivepugitegujupa.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_b062c803b97547c290854650e8d96eb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6713cde0-340a-4f51-9eaa-f29017ccddea/easy_calligraphy_alphabet_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72ffc27-f5ff-4686-a5c6-7e57612fd7e0/19515666103.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_5c58c5d2dbc84d4b9006aaef85cca3bf.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_5ec454987ef1428c8c5c77a6e4f2fe61.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5016 bytes
SHA-256: b05695698b96d5f2cbe89d39b9ad1a60930620220f3a4b53ed0303814f309fcc
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 11428 bytes
SHA-256: 1d0f303fdc8d049ba7dd96edaeae442c69ff69f2fe0cc4553f7efc0f436c868c
font_03_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3