Malicious PDF — malware analysis report

Static analysis result for SHA-256 35678e14f4a2407f…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 03:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ed8e541f07bd5822e7538a2f2ca8e8b SHA-1: e2f2774fd7c5414b27a1cfbb0579191917e14799 SHA-256: 35678e14f4a2407fca18d6251b0e0430a10ca3c5a6ced60ba09c8a340f5bad2c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/award?keyword=bodybuilding+workout+pdf PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/Zcjb8WH/beat_the_puppet_hack_download.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/ayub_khan_era_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/heTghjh/beat_blade_dash_dance_strategy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/EhgCAib/befewipituzudut.pdfIn PDF document text
    • http://rewokujow.scienceontheweb.net/15168534916.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/41224384485.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/iiibBhe/zimubo.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/centrifugal_pump_impeller_types.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
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_6e03784629f348be9a716f3181da065c.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_1f85786640394b019cb6d5f103829635.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_df02967387ab4c1290aabed56bae68e7.pdf?index=trueIn PDF document text
    • http://vefodipox.myartsonline.com/fisher_scientific_traceable_digital_thermometer_instructions.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_51131492999e4010aee91d5bc2c5be52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figidireki/56639702324.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_a021fcdb2ca040288c8436b5858a4519.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_b049c22961b94055b020960d1c73c2e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/case_study_template_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/birdhouse_plans_free.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_2dd00be54cde483cbe7199c610f12fda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/gojekopivefawevo.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_f2184e26837e4adea4b7abe777dbef09.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_6c689a03948f43f5b9e99bb64abf9cc7.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_514f959669b1462e9b4982978012dff3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 5032 bytes
SHA-256: 340f4a233ddb2e2534bae4743c926deef8dd27cb38e13c8d59153660cdccce26
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10604 bytes
SHA-256: bb60d99d040810777f4a5bb4bcd4a2adfe735408425f8f475c43e571c16479a0
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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