Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7c5728afde059f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-09 20:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dc9dfafcb7ef3d6b67f667765d95d4a7 SHA-1: d14766b44d79b2fb06fa26f8a4777389eca21987 SHA-256: 7b7c5728afde059f892c42718823b371ed8b6c456345ff432840768854dfe06f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=crown+ce1000a+service+manual PDF link annotation
    • http://xokapik.mywebcommunity.org/authorship_of_hebrews.pdfIn PDF document text
    • http://topcreditmonitoring.info/femexezavoopjzw.pdfIn PDF document text
    • http://stickerrus.ru/19696683023nru7i.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/the_art_of_r_programming_by_norman_matloffo8sr4.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/kodakapanilujotaredi.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/nodisogejubumisuguk.pdfIn PDF document text
    • http://chtotakoeverti.biz/fukeziminusifr9fe2.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/farewell_to_manzanar_chapter_12_and_13_summary.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/54420833602.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/12_articles_of_faith.pdfIn PDF document text
    • http://varistop.site/dewalt_pressure_washer_3800_psi_pump_oil0ajuv.pdfIn PDF document text
    • http://chelamela.org/nerozaborekirakunp2fs.pdfIn PDF document text
    • http://qqkaxes.xyz/the_lightning_thief_chapter_748np9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/56c1b740-f865-4af8-96f9-f5e97700c6de/pride_and_prejudice_movie_2005_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac3afb1-fa58-4453-8183-b42007f3888d/how_to_get_hp_deskjet_2540_wifi_password.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_52d0022a38cd44388b2fb44296d22a38.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_9059c84c372944898081b7840b9be606.pdf?index=trueIn PDF document text
    • http://makakanow.onlinewebshop.net/52044562611.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/lukerowudulabefob.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_066062f36b434e9bb71dd3a88be26a2a.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_bd8ac2c0cf8d4e3a8239f8de0e1f7cab.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_70f8adb2025e4743bae8b0c8fd5231c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac519e3b-9049-4430-84ca-293e9e9b02de/38922454790.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5116 bytes
SHA-256: b807d888b2c03e5186512dbfd570b89f8e8ab4730b3d532e90b555d861a7c6e9
font_01_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 11104 bytes
SHA-256: 4774c6781408b385b08dd65ea3e996257a4dfb644156259f640fc44af6e0d178
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333