Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc988d2e2322730b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 00:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6871b9b0cae84ad03859409a1705bfc SHA-1: 70570210c7e24de21e540702d7b572cae68b7d4f SHA-256: cc988d2e2322730bbf574ac9dc0ea7f7d91cf4d92e35c805bf0dac1dd68c30e7
176 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, characteristic of a link farm or phishing lure, disguised as a search result for a PDF. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=matter+and+interactions+4th+edition+pdf+free
    • https://cdn-cms.f-static.net/uploads/4404529/normal_6042e566b90a5.pdf
    • http://lakuvekavepoka.iblogger.org/bobuweweruta.pdf
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/vuwem_zagexubezisi_wujifupewojo_xipikamutenebok.pdf
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/8201072.pdf
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/8746906.pdf
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6014e514e2a2c.pdf
    • http://mivifukatovaga.getenjoyment.net/63059595566.pdf
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/rejesore.pdf
    • http://kugetogegus.iblogger.org/lincoln_in_the_bardo_by_george_saunders_review.pdf
    • http://vafutixon.22web.org/batching_plant_parts_name.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/5106aeb54.pdf
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/fames-podokelog.pdf
    • https://kudezugomolalu.weebly.com/uploads/1/3/5/3/135331411/sefiligepetopi_wegefipetebaz_zerawipagopiz_legejafarufel.pdf
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/famabuxajov.pdf
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/bilepujizomuxag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jirovod.rf.gd/alaska_truck_simulator_apk.pdf
    • http://pabotojixupi.atwebpages.com/is_the_bosch_ascenta_a_good_dishwasher.pdf
    • http://vugugemo.atwebpages.com/xudobiwofadugo.pdf
    • http://pinipazopit.epizy.com/jamaburi.pdf
    • http://jaweratiz.atwebpages.com/xovuzutozekotuwavevoro.pdf
    • http://fomepufasele.atwebpages.com/toyota_automatic_transmission_service_manual.pdf
    • http://gazusoketa.epizy.com/22729120689.pdf
    • http://wozawexopad.epizy.com/27980391448.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92c.bin
8a8e686186eb8c627b290b1758f7a56871134aefa62131ad397c35cabf13914e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 5304 bytes
font_01_sfnt_off00010b45.bin
31747b2189fb1d8f9f3189461d2a44bdf4129287b989d94fb305e92f85cdef70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 11116 bytes

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