Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce55efba40cc9a8…

MALICIOUS

PDF

94.3 KB Created: 2021-03-22 13:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc53302e17673f8e47fecccc98033fc6 SHA-1: 715db75fa151c80ad787840b3f3183d1517e39d2 SHA-256: 7ce55efba40cc9a808e971dd0317f701f8a2f79a5e5208bbf3a868d56db330f4
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/123?utm_term=ca+disability+form+2501 PDF link annotation
    • http://raraveluwogevuw.mypressonline.com/36673542477.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/dispositivos_oxigenoterapia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_51de3cb344e34b3f9f73038e462f24d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf04f1d9-acfb-427b-bd18-b9b7c28f2851/wavemiludowivinobux.pdfIn PDF document text
    • http://liwununigu.epizy.com/android_sqlite_database_tutorial_step_by_step.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_32081e258b524640b30afb9ff462534e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3fbdc5-e4b0-4c41-be80-8f891490aeb9/john_dewey_high_school_dress_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d083c1a5-1882-4df3-a98b-e1efe2b9bd3b/befogozozegefududakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed04327-8eb5-4314-9878-7db45218783e/zoled.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_a5a2a6c62b77444cada2c8994082e88b.pdf?index=trueIn PDF document text
    • http://vitawijeroma.rf.gd/45878040417.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/fl_studio_mobile_tutorial_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6306dbd-3e16-4b3e-a0f3-6fa748a36eff/tekugedifipetamikabodile.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/computer_course_download.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/icj_advisory_opinion_kosovo.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/4347414763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371025f7-0b2a-4ec9-bfa6-7ae34f171e6f/how_to_troubleshoot_fan_relay_is_bad.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_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 5652 bytes
SHA-256: 636007642e52d21ec751f344f2570bcd02f424780843a54c4cdcc017793d3fee
font_01_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 11644 bytes
SHA-256: e94a1dd2ab04837543d779b6ac4c8e470b433063f571b2d05d879497e19fc4d4

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