Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6cad61bf1797a8…

MALICIOUS

PDF

78.4 KB Created: 2021-04-28 06:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ea7e7cc9943aff7eaca67357a941bdc0 SHA-1: 16964668405f93cf1d4fa55a055a5f08befbcda3 SHA-256: 4a6cad61bf1797a8576a2d6db938065d4cdb175ba6abf8b3527a07f27aece85a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+reboot+alcatel+one+touch+ce1588 PDF link annotation
    • https://cdn.sqhk.co/jusupovexewa/gey0hba/okc_thunder_rumors_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/jdhbHhf/bricks_breaker_infinity_mod_apk_download_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/hgifjcA/teduvuvevodugikazavuguz.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/bidgfgd/baking_dessert_recipes_from_scratch.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/nutizire.pdfIn PDF document text
    • http://fruktovik.com/comptia_server_study_guidexnk5w.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/bexopoxojiwetujisu.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/jeFjbgh/infection_control_course_dental.pdfIn PDF document text
    • http://ketadiets.site/toshiba_dvr620_dvd_recorder_vcr_combo_with_1080p_upconversion8fj98.pdfIn PDF document text
    • http://1yamal.space/74807712943w84qw.pdfIn PDF document text
    • http://rineset.xyz/xivugajuwegawejolajwuiuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remuv/baazigar_songs_starmusiq.pdfIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_6404164d9e564701bf054b7db57669c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a969389e-5aca-4411-823c-6aedf1314c5c/nirugebuxaxafisejuriv.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/how_to_stay_honest_in_a_relationship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ec3b3f-227d-46af-96aa-086f3525529b/1st_grade_math_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f60b48-5ac4-49ed-9583-ef6256ce65e6/buzikadulu.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_cc91dd7fc09949298dd85d8fd854ac72.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_3351f14caf6f42d9900483e2b33565e4.pdf?index=trueIn PDF document text
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_98de2b256cbe499ab79da67387ed7502.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 5272 bytes
SHA-256: 8638e84e3e054bafc0a8b16e0531c3fb1d03a1057344c971cefb1581fbf9434e
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 11152 bytes
SHA-256: 19a7bff2f03f767ca3cc442731014badeb1795328cf716615f2cd9a281ebc24e

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