Malicious PDF — malware analysis report

Static analysis result for SHA-256 53361fccd1b122b2…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 03:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1ca9c960c1e2750860169d71e3867ec5 SHA-1: 54340652ea23daffad0ab6f1da47ef33df395910 SHA-256: 53361fccd1b122b2eee68879cf1bd8db8e2def51cc2fdfbad63056cc4a6b2fcf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure and the presence of multiple links on disposable hosting suggest a phishing or scam attempt designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=dayz+guide+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_601dba2844a63.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/16481878422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_603b25f5d436c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482406/normal_5fe1b4f7ea682.pdfIn PDF document text
    • http://jusotupiz.iblogger.org/85961304493.pdfIn PDF document text
    • http://palawawez.mypressonline.com/newumeputebajex.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/cyanogenmod_13_mirror.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/the_darkest_minds_never_fade_movie_trailer.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/40452831141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipiwimepi.epizy.com/gilalotofokisujenet.pdfIn PDF document text
    • http://musizaxodolof.epizy.com/blendtec_recipes.pdfIn PDF document text
    • http://gupemag.epizy.com/type_a_vs_type_b_personality_test.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/automotive_spice_guidelines_1st_edition_2017.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_6599e529b0484c1eab81222d0ec84288.pdf?index=trueIn PDF document text
    • http://gakilasefit.myartsonline.com/mrityunjay_kadambari_free.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_571d3012c051468380a9feeb559d5353.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_46255e02c8464fc98a7ad792922171d8.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_0f9e7516909d4235954876dd356e0cdb.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_e69da5806c644139ab653106f5d532f8.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_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 5040 bytes
SHA-256: 9cb5b598099371acc981ad81ac8c06e73104423dfac0b6a41e942492924999c9
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 11312 bytes
SHA-256: d72cfd227f68dc00622016b7c1a90da2585b5abeadc7c94884e2e3f0233878dd

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