Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a1d075d379ca51…

MALICIOUS

PDF

122.6 KB Created: 2021-03-17 17:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f063182c77b9fb32017b3ccbbcef34c4 SHA-1: e6d5d9d3a5f8e46d7ff46fe25157a50e0a84b44d SHA-256: f1a1d075d379ca51d7cada825d25ee9f1b3176d0ba5fbd48f9dc7abf020e3122
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure to phishing or malware download sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=alice+in+wonderland+complete+pdf PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/9927489.pdfIn PDF document text
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/lubutozus.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/fuwaponal_jegafabojux_pamagu_xenew.pdfIn PDF document text
    • http://ganutaragifak.22web.org/250cc_dirt_bike_for_sale_under_1000_craigslist.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/bujuli-lilisemixifomed.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/resalurodotakudisawonimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobemiko.epizy.com/33604203940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca22f6a-2882-4264-a27b-bde8062e061a/delonghi_magnifica_smart_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/20626473567.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/firefox_67._0._3.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_4b7aeaf496424ef5b42c9c7ef2c6ec4a.pdf?index=trueIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_8363faaafbed4dd3bf63848ce72a852c.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_37d3b5701977421580c85b389a5555fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/how_to_unlock_a_sentry_safe_with_dead_battery.pdfIn PDF document text
    • http://tupazovux.epizy.com/formation_agent_d_escale_air_algerie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9295733f-67e0-4a87-874d-aea4989196e5/what_did_jackson_believe_in.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_7ee6463320b64d3d8f9a9a06eaca1c79.pdf?index=trueIn PDF document text
    • http://kofupugixujodin.epizy.com/what_is_a_calzone_kebab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f16099-102b-4181-9503-740e694c04d1/lujipatij.pdfIn PDF document text
    • http://zinebozozapi.rf.gd/sodujemimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20821816-d155-4726-b3b4-dc5210e0cb53/96438248626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff332300-cf4f-4fcb-8ea3-d6a11d2e0f7e/98341255387.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/83782608954.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_99605972cf9443788b91025e55c0b310.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_off000190fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190FD 3756 bytes
SHA-256: f2693c1a200ace42271c44a10fd8e1efe8515276ee730073ee8055f85b9a775e
font_01_sfnt_off00019e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E4E 5204 bytes
SHA-256: c9950ae0d68ce4018067fb87d5c8e83b43418a4247052a744f63a147ecfbf904
font_02_sfnt_off0001b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B000 14228 bytes
SHA-256: 60bdb107a8bed1765eb13d44af791d11a43091b9698173e21fb6c8396d99f594

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