Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc773e64ca2611…

MALICIOUS

PDF

138.2 KB Created: 2021-04-04 03:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0554db4c6b7aaf5515b623aab8ad5214 SHA-1: 2572cd35db12fa9a71d57f019c3c7d1ff7b88321 SHA-256: 03fc773e64ca26117333e6a11970d5d461262a49a2b6140e3dfbe8b2a82fe5e2
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly indicates a phishing or malware distribution attempt.

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=emerging+foodborne+pathogens+pdf PDF link annotation
    • http://kefikajutadab.22web.org/lodupufegojugi.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/1737d2dad3b.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/49293927864.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/jgYhjgf/17509705712.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/84538047426.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/eidDgcx/grammar_and_spell_check_free_software.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/vateluk.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/is_wolf_of_wall_street_on_netflix_us.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/cGibGdh/megan_thee_stallion_ig_unlocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_6058c25d689d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_602144b85e064.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/jeIlHja/43260254556.pdfIn PDF document text
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/revave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5fd3521e2e1f7.pdfIn PDF document text
    • https://nowigusoludi.weebly.com/uploads/1/3/4/2/134266380/poluseroti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_605ae3afd5d53.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/JieG2a9/lutawimejure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/635c0386-9814-4ef3-9d46-3343877b595b/shure_ulxd_sm58.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/validity_and_reliability_test_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d305392d-63dd-4e55-a7b5-384a9d3ea963/aircare_1045_replacement_humidifier_filter_wick.pdfIn PDF document text
    • http://rawegutidum.onlinewebshop.net/wisup.pdfIn PDF document text
    • http://jusisow.rf.gd/bonobuvapujanijazakup.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_off0001e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E330 5520 bytes
SHA-256: 7cce1a7fcc3236caf44cba6b78dbefe7d6b7307ecfca677b0c5227ffcacec1bb
font_01_sfnt_off0001f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5CD 11520 bytes
SHA-256: a60c880292cd5d8062ac751b41800935d3df75ae1a6ca50fd4ef4b764a12e2cb

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