Malicious PDF — malware analysis report

Static analysis result for SHA-256 174054c48e3bca3a…

MALICIOUS

PDF

65.8 KB Created: 2021-04-14 11:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4983e40e895ea4f9dfa9533e6a770157 SHA-1: 2f0eefe40cf9f28d924a9af268ca58db7eda9ade SHA-256: 174054c48e3bca3aa6168c2c033e6c200e3d206b1035ab8c64e4e6b2b2f9a762
154 Risk Score

Malware Insights

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

The PDF file contains embedded links pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to educational content ('elastic potential energy worksheet answers') to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=elastic+potential+energy+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6045d767ca4b8.pdfIn PDF document text
    • http://startbastar.online/90353124336gp2b2.pdfIn PDF document text
    • http://antinomi.design/fajewixikuxikanugomej1dg2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc73a0d00357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_60278945f3914.pdfIn PDF document text
    • http://demask.fun/fisher-price_newborn-to-toddler_portable_rocker_assemblys6qpx.pdfIn PDF document text
    • http://handler-autoscout24.com/megen9aa4a.pdfIn PDF document text
    • http://study-english-02.space/manual_ar_condicionado_portatil_pinguino_pac_c1056ay7b.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/zudosavuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_6037fee737de7.pdfIn PDF document text
    • http://aarbuz.space/vshred_free_download6e3mf.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/95549813010.pdfIn PDF document text
    • http://tobaliwono.mygamesonline.org/cervical_spondylosis_exercises.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/jaxesabi/kitchenaid_refrigerator_repair_denver.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/pabipopazibosowirubik.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/dafurevepepe.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/answers_to_riddles_what_am_i.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/asterix_and_obelix_comic_books.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/selfie_bebo_sambalpuri_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/nigizulexefarawuxoxixa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 5408 bytes
SHA-256: 937a67279c9f8244cbcdaf85fbf7ccfaf4dce1a874797e91484d7afc8ce4e908
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 9584 bytes
SHA-256: a293c3a132edf675c64d12b93d27c82310ea70e7e20ef37403eaf7e9c6353056

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