Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c855d587dc88c66…

MALICIOUS

PDF

75.5 KB Created: 2021-03-30 13:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24cee4de0fbe95c55ef80efb5e02f2f9 SHA-1: c39c333e5f32e7e0dafd97ddf7db36b9bfe34258 SHA-256: 9c855d587dc88c66a5888032a55b77f5c4b264346cd536c4b64d5744d7a28bea
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to 'common chinese tattoo symbols' which is likely a lure to disguise the malicious nature of the embedded links. The presence of multiple links on disposable hosting further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/aws?utm_term=common+chinese+tattoo+symbols In PDF document text
    • http://xapiduxirob.mywebcommunity.org/can_you_calibrate_an_infrared_thermometer.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/ernest_hemingway_house_tour_oak_park.pdfIn PDF document text
    • http://podcard2020.site/9487259599h86le.pdfIn PDF document text
    • http://retoxen.mypressonline.com/9317834863.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/6641850716.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/50920500720.pdfIn PDF document text
    • http://tortomsk.ru/setagokubivaxukenominog5y2cp.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/how_to_properly_install_a_pipe_union.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/como_agua_para_chocolate_analisis_mama_elena.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/pegewowakode.pdfIn PDF document text
    • http://misiwoferejisuj.rf.gd/75770915941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daff257e-27f6-4f1d-98c1-080e7b687b69/belefuvatapuwe.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/bipowopiwid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0433ef07-716e-4081-a809-27fa65583a88/www.perfect-english-grammar.com_present_simple.pdfIn PDF document text
    • http://xikapewegoruzom.epizy.com/78136502887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd8dd47-5890-4d74-8e6d-d059765f7433/aviation_weather_taf_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5cfee0-6c49-4aed-a032-2c571c486d9c/31178085103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b1a80e-a288-490e-81ce-f0c2df7298d4/dizupaxutujutiwademupet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5088 bytes
SHA-256: 2d03fd0d49601bb8289e08d1cdee891c79c200fb00bb325833cb318997ff6758
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 1880 bytes
SHA-256: 4d8699bd7527bc0d9365cb01bf7fc3d8fdab123ed33e39f1ad1ae9c91ffa025c
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10436 bytes
SHA-256: 48ec13f9572f076128dbfd92974d37cc7cee59211c39c2ff1bda4ddd3a9c126d

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