Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbfc656f40384cf…

MALICIOUS

PDF

72.4 KB Created: 2021-03-25 10:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 299015fa5f79aab6f327f89bfb9f7639 SHA-1: ced93eb3984b8537d11e66b0006c2771cf8ad789 SHA-256: fdbfc656f40384cf2a36ea2a5e6a52f71d2112c3b28e9ed06e6aadcd21d59c4c
186 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 domains with unknown or suspicious reputations, indicating a link farm designed to redirect users. The presence of a critical heuristic for PDF SEO link farm and ClamAV detection as Pdf.Phishing.Trojan suggests a malicious intent to lure users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection imply an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=ministry+of+sound+clubbers+guide+2004 PDF link annotation
    • http://gexuveruk.iblogger.org/dark_souls_3_builds_fun.pdfIn PDF document text
    • http://nudistoff.club/66826534928pmeel.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/wuxofa.pdfIn PDF document text
    • http://instapodarok365.site/rirabuvenawipuroxubaxiggae2w.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/93414242072.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/how_to_cook_brown_rice_in_a_slow_cooker.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/bidojezexabij.pdfIn PDF document text
    • http://tvoyoproc.fun/20781266866zh328.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/kadezizeg0ljep.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/pocket_juice_wireless_plus_3_in_1_portable_charger_manualubimi.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/catholic_rosary_prayer_for_the_dead.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_reset_xfinity_remote_xr2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48b5267-8f02-4449-b06c-08839b01560d/rca_visys_25424re1-a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b938d22-f725-434f-a055-07c608a93780/what_is_the_meaning_working_knowledge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afae412a-d8b8-4a12-8e8f-171fb91d9443/ganamrutha_bodhini_sangeetha_bala_padam_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ec78ee-26f3-4445-8cbf-4fe2ed8a11ed/xoluxaruwurilezob.pdfIn PDF document text
    • http://susijul.rf.gd/is_oxford_comma_ap_style.pdfIn PDF document text
    • http://tagafivufexe.rf.gd/houghton_mifflin_harcourt_collections_grade_9_answers.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_c7671170e239408886863e2941cf0108.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c62a25564e2a48b7b5d238094670d1de.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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 5588 bytes
SHA-256: 3d606b8db0047689486ab270c56b5bea4929bd9f5817b8275bcd44519dbc4983
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10384 bytes
SHA-256: 731d36faf69df650e4eaa13ebf1c0871bec095619722e930535ab8fcaf4a6655