Malicious PDF — malware analysis report

Static analysis result for SHA-256 447da49e7ab92b43…

MALICIOUS

PDF

81.8 KB Created: 2021-03-19 18:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c008dd6ab3b7f189ee4f58fdedcdd8f0 SHA-1: db6b1726dc7e1124f77befa84598e2d68ffd21ac SHA-256: 447da49e7ab92b4327d17db1b3e893b05f3d9c6472e028e9540b15a65aa33e9f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'human body pushing the limits brain power worksheet', which is likely a lure.

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/wix?keyword=human+body+pushing+the+limits+brain+power+worksheet PDF link annotation
    • http://mojadejazisapa.sportsontheweb.net/jivudo.pdfIn PDF document text
    • http://zexezolevonim.iblogger.org/how_to_write_an_evaluation_examples.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/16023614846.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/iaYxghK/59393976865.pdfIn PDF document text
    • http://akmurzina.com/wendys_french_fries_nutrition_information1dayb.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/98782631803rklcj.pdfIn PDF document text
    • http://mugedly.xyz/harbor_breeze_ceiling_fan_with_remote_and_lightwh5iu.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/wjfCjbt/stickman_skate_battle_play_online.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/audacity_manual_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/jajigjs/cake_knife_cutting_cake.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://dikavara.epizy.com/fusionner_des_fichiers_sur_mac.pdfIn PDF document text
    • http://ropurudowilume.rf.gd/sarajevo_haggadah.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/17457770505.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_1589dcc63bc7454eb499ce0a4b8202ec.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_173adc572d724b76a76e2f6b88f87d2c.pdf?index=trueIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/bristol_zoo_map.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/19237192192.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/castlevania_harmony_of_despair_item_guide.pdfIn PDF document text
    • http://kabutusagop.rf.gd/zunoleje.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/why_is_my_uconnect_not_working.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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5616 bytes
SHA-256: 3064426a5c19c9feef68b10d193af82420c0ba13428b4c80513ee25db50e6e0c
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10712 bytes
SHA-256: 0bda3e638204e410021444fdebbf708b143a1503f36e85ab8770069530674085
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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