Malicious PDF — malware analysis report

Static analysis result for SHA-256 d558aeacd7e6ec15…

MALICIOUS

PDF

85.1 KB Created: 2021-03-29 02:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 15b9bd5c59854846ccd5cd37a3cd469c SHA-1: 06acbb3ac6e6b59dc9447e3ef79462e50fdef7f2 SHA-256: d558aeacd7e6ec15b204845540ecc8a9e30ab9b4276eb850deb83b4cc306ef52
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one pointing to 'resalured.ru', which is identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=me+before+you+pdf+ti%25E1%25BA%25BFng+anh PDF link annotation
    • http://veruvipavopa.getenjoyment.net/gaxagupopuvojenimiwamok.pdfIn PDF document text
    • http://bbcua.site/39141252253573k7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5fc770a21c901.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/business_model_generation_alexander_osterwalder.pdfIn PDF document text
    • http://hurleyshamburgers.com/vikezubugalutaxibor4cfrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_60380d6e0d252.pdfIn PDF document text
    • https://zegarujavo.weebly.com/uploads/1/3/4/6/134667802/2c2d545e.pdfIn PDF document text
    • http://alifan.store/directv_genie_remote_change_tv_inputktskd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5ff8d87d7b41b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fca4556826ae.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/carnatic_music_notes_in_telugu.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/anterograde_tomorrow_fanfic.pdfIn PDF document text
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/9453829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_74fda3a6ac3346b6bdef7a461dd72fcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/lodolasilejumo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/co_star_astrology_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/54781841004.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_9a88ca03e2f2417da99a25127b1cfd37.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_95db885f7b5e4472a7f5f87dfac52cac.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_bd085302e7854171a5125fbc5fabcab2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/sagesefonepax.pdfIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_dc10e450bfe74026a428beb53cb58f4b.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_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 5512 bytes
SHA-256: 341bea303cfa8ad4c723404301e736c93489e1e68bdd01c1b07b60fe3be8ad93
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 23424 bytes
SHA-256: ec7977cb529a3f6877ddf02a2ebc3afdac3c8afd8a3e1fbefeb9e8e870ae956b

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