Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba7972060283c37…

MALICIOUS

PDF

90.3 KB Created: 2021-04-02 13:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3d10db92486625b0475e13d902fbbae7 SHA-1: 5f9b14705c55c9d6deebc630f04d0bf1814474e8 SHA-256: bba7972060283c37e2365ec63009d0e7e4f80c339d0c7e40c39478515f817ffd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of 'asn.+1 decoder' in a URL suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=asn.+1+decoder PDF link annotation
    • http://c-advance.space/kamigagekinunwzz6v.pdfIn PDF document text
    • http://acupofjacob.com/20798523537dnxyc.pdfIn PDF document text
    • http://fullcreditreport.info/devotional_audio_songs_telugu_free6qw5o.pdfIn PDF document text
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/muvit.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/035738c6b24f6.pdfIn PDF document text
    • https://gavevuroboba.weebly.com/uploads/1/3/5/9/135959422/dojuzov.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/0b296fbb90.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/6d8d417.pdfIn PDF document text
    • http://madalez.22web.org/ideal_home_christmas_gift_guide.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
    • http://vefolavasetana.epizy.com/sarah_plain_and_tall_trilogy_dvd_set.pdfIn PDF document text
    • http://bobofawas.rf.gd/beginners_guide_to_real_estate_investing.pdfIn PDF document text
    • http://pikugire.epizy.com/81031077385.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/xewubojibu.pdfIn PDF document text
    • http://neduweleviwov.rf.gd/rmit_application_form_for_international_students_2020.pdfIn PDF document text
    • http://bageradafasuk.rf.gd/basic_computer_training_file.pdfIn PDF document text
    • http://jopakete.rf.gd/wonejodanofurejogu.pdfIn PDF document text
    • http://kesurodijafezup.rf.gd/33086511601.pdfIn PDF document text
    • http://merujepapi.epizy.com/avery_barcode_labels_software.pdfIn PDF document text
    • http://wudokuzogikozu.rf.gd/sinap.pdfIn PDF document text
    • http://nakodazik.rf.gd/mokadadipiganojajati.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_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 4424 bytes
SHA-256: 330cb5b55a67a95b04f0effa3374a7d8de14dc5a03749a34e80d0a9c283c9b19
font_01_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 11796 bytes
SHA-256: 7389bdf0ab59113a880534a5c183f2eb3da2d6d91050448e6d7caf45a2116d45
font_02_sfnt_off00014d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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