Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc01ae184a0f34b3…

MALICIOUS

PDF

77.3 KB Created: 2021-05-08 23:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5c880bc1d9a6f91aa3d3a8f890b4eaf SHA-1: 6b665dc6362f770e2af9366b155506b972602760 SHA-256: dc01ae184a0f34b36e802bcb6a6865d391f88ac056c8180799c85c9bb8882d1b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. Several URLs are identified as malicious redirectors, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=calories+in+bojangles+sausage+egg+biscuit In PDF document text
    • http://clebohets.xyz/how_long_are_the_extended_harry_potter_moviesiuzcc.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/how_to_reset_adt_cameras.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/memoire_energie_renouvelable.pdfIn PDF document text
    • http://kartaidatodemeleri.com/why_is_my_hyundai_sonata_not_startingpn84t.pdfIn PDF document text
    • http://creditscorefix.info/26443822850aq2uc.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/how_do_i_get_serato_dj_pro_for_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_01fa6765cb6c4ef3b1d49624df061402.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dda3243-bf77-442d-b208-68d62b9bb73a/the_real_story_of_the_three_billy_goats_gruff.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_342318092eab43338006531d13ee799a.pdf?index=trueIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_108072ffa1d34cd6960c59c24b188750.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_9ecfaa86d40141c8acbefe875d1359d0.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_20a99f2ef1ee4285bf720e298c6ac8a6.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_de7a2db70e24457a89c57cca96457985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remuv/how_to_find_a_resume_writer.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/design_algorithm_and_analysis_notes.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_6ed5818a805d40dcad5d6afa140d1cbb.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_973d07dccf2a44168f6d4be261c06d78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3eb1edf-e09e-4e1a-ad02-b8a2a325b160/dell_precision_m4500_core_i7_specs.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_3a9b47d661b84ba6b3edad688dbe7bcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefipa/logitech_ue_megaboom_speaker_replacement.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_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5088 bytes
SHA-256: 84a5999614279b8e5ba9af6af95ef993fac634cda6aa8933f9f090fd627c10d2
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 11148 bytes
SHA-256: 6440bf1da197d6100f475613aec1135be7c496f1606d48d9b31ba4bea0e050a2

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