Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4185ce8e5e7067…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 20:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d97479dd5960f06f07b42ea34059f3a8 SHA-1: 04f395c32c530bc634dbc3821df12bbd9082050f SHA-256: bb4185ce8e5e70676952b66128eaf79442abbb57be3263b64d9343976f5bb163
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many hosted on disposable domains, masquerading as a construction equipment guide. This behavior is indicative of a phishing or spam campaign designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/123?utm_term=construction+equipment+comparison+guide PDF link annotation
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/3844699.pdfIn PDF document text
    • https://kesavowefobulet.weebly.com/uploads/1/3/5/9/135976175/6b9e0f31.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/kimonovujokitadasago.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/depegigut.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/temafirabovukox_lebopugevebogum_xorubupebid_rolugi.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/3942196.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/vagefoximimavo.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/vemunulu-daxipaxobig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_f3a4cd7cd085409380bb125e45562d83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d2ac8d-db42-46f1-9888-f61e18262401/nikon_coolpix_p520_instructions.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_b21fcd3079f9429bbbd617c8628ca652.pdf?index=trueIn PDF document text
    • http://bajipogijos.epizy.com/pandora_bracelet_safety_chain_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea2bddc-fda4-4f58-9029-325790fe824a/echo_srm_230_parts_manual.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_f48d3cbf8a6e4c94a4e4d934d5d2ec25.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_7257b535fa404ca0a5eef1436ab9c085.pdf?index=trueIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_a54918fa27934877a70981e272ec03e0.pdf?index=trueIn PDF document text
    • http://towupew.epizy.com/audio_editor_free.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/muslim_baby_girl_names_with_meaning_in_urdu_and_english.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_0821c03df2664a7fb3fa78a14da7da2c.pdf?index=trueIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_f6f178ef090e462dbf52a82999e4266e.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_7929623aefd9451eab07cb36f52b1270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8cb452-b02e-46d3-8109-964ed39ade71/monikatifibotiz.pdfIn PDF document text
    • http://ritanuwo.epizy.com/overtime_pay_dole.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_09a2fe1ab2ac40a19d2224b585a92955.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e76e7e-537c-457a-98c5-60a2f41e4e57/sijunebenitefur.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_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 5392 bytes
SHA-256: 4542714e704b52f1234e02f37d23068250beeac4bc5ba369a5843e7882195635
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10740 bytes
SHA-256: bfe2e605e3f44847eaaeb68ef4fe2f053331a593a6d0a72298c2ef653c917a7c

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