Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e7bf8f850098ad…

MALICIOUS

PDF

79.7 KB Created: 2021-06-08 06:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc77230b08e5d9e77a9521652698b45 SHA-1: cd49c053b3869023c45989565c5d35a6740ce4e2 SHA-256: d7e7bf8f850098adb26d5c365905493bac08f7e6c116426674d9d829b3875b61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent external URI points to a URL that mimics a search query for software, suggesting a phishing or SEO-based malware distribution tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/wb?keyword=data%20flow%20diagram%20software%20free%20download%20windows%207
    • https://cdn-cms.f-static.net/uploads/4451542/normal_600f57ff2d0a1.pdf
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/bbbd24c.pdf
    • https://wojawuminusevob.weebly.com/uploads/1/3/4/6/134694879/sezasore_savosubiseta_metujasema.pdf
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/mixavarupuruxebeka.pdf
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/534526.pdf
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/3915646.pdf
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5ff709e59c32c.pdf
    • https://nilorajokurede.weebly.com/uploads/1/3/4/6/134626806/1366635.pdf
    • https://cdn-cms.f-static.net/uploads/4369318/normal_603f21aa2f78a.pdf
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fc6a7958e25f.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5fda5b6ea7177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6015177d-a8f6-421d-9032-b40d81ff960d/bsa_sweet_22_walmart.pdf
    • https://uploads.strikinglycdn.com/files/eb47e99e-ca51-4e0e-a150-e8f675c18fe6/surilubofuril.pdf
    • https://uploads.strikinglycdn.com/files/1b92b48e-2366-45ae-bb17-1f963d711a98/can_you_read_korean_books_on_kindle.pdf
    • https://uploads.strikinglycdn.com/files/5fed19e6-f9c3-471a-b9d7-d2df5f7079fa/how_to_summarize_a_chapter_of_textbook.pdf
    • https://uploads.strikinglycdn.com/files/e2b078e6-e866-4b5b-a512-a314e24249c7/befokufutozumuropumu.pdf
    • https://uploads.strikinglycdn.com/files/0c90dded-f237-4854-874c-cc74f466e601/c_d_dog_food_ingredients.pdf
    • https://uploads.strikinglycdn.com/files/128a46b6-2f01-4764-8e9d-a30be1a14762/disney_park_pals_how_to_use.pdf
    • https://uploads.strikinglycdn.com/files/3323f796-629a-4dc1-8a01-0011fbdabcb9/2157999984.pdf
    • https://uploads.strikinglycdn.com/files/6353f400-a669-43f0-949a-0e3ce9be098f/13192645564.pdf
    • https://uploads.strikinglycdn.com/files/37aa38ce-9704-4dda-b99d-1be40cdf90f5/remuvumejuwagovasinewew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb41.bin
f449716568837990e81366d2f31bcc41d69467c6df2d97be99d5ea5279658d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 5400 bytes
font_01_sfnt_off00010dac.bin
500ced2d8206f2122c488d1576e4c6ca09dda93a60abde6eac0e551f8d741d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 9920 bytes