Malicious PDF — malware analysis report

Static analysis result for SHA-256 3625e5df4a2a5c2d…

MALICIOUS

PDF

77.5 KB Created: 2021-04-14 05:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe1047ca816e2124ff4eec2593d6e3d SHA-1: 508c5bccfa1bc3c740274abe6861a3ca48b702be SHA-256: 3625e5df4a2a5c2d82ed4e3de995f7086e338d6afa53540af3a6bd53369fac25
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 pointing to other PDFs, suggesting a link farm or SEO poisoning attempt. The primary external URI, 'https://dafemum.ru/strik?utm_term=us+history+trivia+question', indicates a lure to a potentially malicious website. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan distribution attempt.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=us+history+trivia+question
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd1041be7ea6.pdf
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5fee8ebee7a62.pdf
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fcf45dda2efc.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6058b1344d193.pdf
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/21853a21820d3e.pdf
    • https://rejosunofefi.weebly.com/uploads/1/3/0/8/130874376/mijovijigidutotove.pdf
    • http://astrology-personal.online/children_s_beds_for_sale_gumtreelse5h.pdf
    • http://manthoughtswebsite.website/jawbone_big_jambox_user_manualfc19t.pdf
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/wemikolipemi-lufesiba-lisaxeluj-kakanivavo.pdf
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/tutexefamana-nomiwujuxivexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavebufevodutob/bovawi.pdf
    • https://uploads.strikinglycdn.com/files/a1af45be-aaab-4406-b903-4fe76d321594/google_search_console_website.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/dawn_of_war_2_retribution_unit_guide.pdf
    • https://s3.amazonaws.com/tidigudetefumof/67993021955.pdf
    • https://uploads.strikinglycdn.com/files/1d6704ec-2c4c-4141-896c-06e47bc088a7/wutoxitaf.pdf
    • https://uploads.strikinglycdn.com/files/2773170a-67ae-4cad-8158-7714cc9b65cb/fozimebe.pdf
    • https://s3.amazonaws.com/bupijila/chaplin_1992_full_movie_free.pdf
    • https://uploads.strikinglycdn.com/files/d463157e-41b1-488a-941c-c4803317f528/d_link_dir_615_problems_wlan_password.pdf
    • https://uploads.strikinglycdn.com/files/7fa3b085-80e3-4c89-ba0b-958007df81ff/dubunifevemexewunusono.pdf
    • https://uploads.strikinglycdn.com/files/8b903370-dc0b-4614-a65e-39d3dd54e289/how_to_check_your_business_credit_score.pdf
    • https://uploads.strikinglycdn.com/files/eb2872d7-b586-48b1-aa58-fb8569cf42c8/swahili_dictionary_apk_download.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_off0000f2b9.bin
86b154e0fb6d73ad3421362571a15f15001b2308bf91cff12bdc33f49597870b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5020 bytes
font_01_sfnt_off000103d7.bin
7dde116c71d3d459f1f545f5d68e9628b74a67729f6a51e985338b38370dca1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 11036 bytes

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