Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0efec9fdc857dfc…

MALICIOUS

PDF

80.6 KB Created: 2021-04-05 20:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 115a2ac444267e3ca56cbea812647e4d SHA-1: a80e8de82f7a5a3b22e18a23638fac39995004bc SHA-256: a0efec9fdc857dfc360c506fcca9b5e5fceeb549591b02a205c62459233e87f3
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://jottigo.ru/123?utm_term=skype+offline+installer+softpedia', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/123?utm_term=skype+offline+installer+softpedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d7e033d10.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/5b7d318eb2375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_601dd28439a70.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/75017216260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600f1fb90bf05.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/dexepazuz_nukazitazat_soriwitusar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5feeef12206bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365627/normal_5fcd81964836d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_60688b81bdd4a.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/d855d4.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://s3.amazonaws.com/pezofut/49660087517.pdfIn PDF document text
    • http://womutevu.rf.gd/pududigo.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/edital_prf_2020_cespe.pdfIn PDF document text
    • http://tojulov.epizy.com/tudisi.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/chipotle_chicken_bowl_nutrition_information.pdfIn PDF document text
    • http://kidured.epizy.com/books_of_the_bible_in_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/articulos_sobre_cancer_de_prostata.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/rufediradililito.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/iconoclasts_vita_trophy_guide.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/upcoming_bank_exams_2020_20_full_list.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5092 bytes
SHA-256: 1c882655a12d78ee3eb8754b0b72ad0f4c592a76fec9758ce2875640cf0c24df
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 9988 bytes
SHA-256: 44665303de32fd475c1569d96ea63ae813831c72a6af1aced0b446cd879b4542
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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