Malicious PDF — malware analysis report

Static analysis result for SHA-256 33184d20e11917a4…

MALICIOUS

PDF

84.8 KB Created: 2021-05-06 17:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 30f30a2c6c1e27a563b9dad70980bc06 SHA-1: 30278af350456961483449a3f7b57459a44aee21 SHA-256: 33184d20e11917a42da344c5a4c485b67fd85383bbbda45c9e8c0fd188b8100e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging a PDF vulnerability or social engineering to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=tuba+finger+chart+3+valve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6010197b32be0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fe502950b813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_602ebb3a0949e.pdfIn PDF document text
    • http://clubstore.info/how_do_i_reset_the_lamp_timer_on_my_mitsubishi_tv4i4jf.pdfIn PDF document text
    • http://dalnoboyi.xyz/39644655012unbsx.pdfIn PDF document text
    • http://slimitalia.space/peter_pan_short_story_with_picturesy68y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6044fb910a78a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_600889523e40e.pdfIn PDF document text
    • http://br1.red/90351856875i8xjr.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/affordable_child_care_benefit_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/ag_word_family_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e18f020-cb81-467d-bf7f-f3efef083d4d/craftsman_208cc_tiller_carb.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_65ce427499df4937a0aad368e63776c2.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_c163f19e67814a4884a38bdae1ad8320.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/is_arris_sb6141_compatible_with_xfinity.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/aos___khorne___bloodbound.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/wim_hof_method_book_barnes_and_noble.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_12885cbf3f6d44529ab5984dc3522ad1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/86954322346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be93658b-94db-40b2-96ca-181d7aba2478/excellence_el_carmen_punta_cana_reviews.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_55e8cfaa108445af9306ba4d773e2440.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/758e38df-d4b4-497b-a296-95216f70b3e8/what_is_the_tone_used_in_the_essay_shooting_an_elephant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791dd37f-2706-4ba6-a195-b65c8970e737/como_resetear_router_netgear_wnr2000v5.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/female_warrior_tattoo_small.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_d3f174653c4b45269a00fb8061b14960.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_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 5280 bytes
SHA-256: 36097068ee216442933624b70051de5224660537af255f6625be7a53ea2f71eb
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 22720 bytes
SHA-256: 1359840e04ab373b56d06747bb19a1dcbc2e49b99104474ff8d64a4fcf5c1dfa