Malicious PDF — malware analysis report

Static analysis result for SHA-256 5595c7717d62bb14…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 21:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c1efaa6a566379bd04b21a33b4b444e1 SHA-1: 3ff7669b097910c59dbf08d45e16a98dc8ea7bcf SHA-256: 5595c7717d62bb144acb597f97fe229c3225badffa092b6edd9e48565bf70eec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=after+we+fell+pdf+espa%25C3%25B1ol PDF link annotation
    • https://venivuwaw.weebly.com/uploads/1/3/5/3/135308653/zuletolutuzes-kigikijeduxorok-bisewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd67978620fc.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/reditonaregobi-tipigunus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_6014677740a0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fede67635425.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/refimidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_602e5d06d5334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_602cddb1b616a.pdfIn PDF document text
    • https://walegizagoz.weebly.com/uploads/1/3/0/7/130775215/kugurelobuvorimoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_60161fea0a258.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/7256971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6039d5ff6d6f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_60621acfad7bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9374294-25da-4007-ae0f-c99bb355124c/craftsman_18_chainsaw_chain_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd2e239-e8b4-457e-aa30-a0e0b6e24861/72375437857.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e85247c78d1240a986b93f39d5d44077.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_fa5fd1f6503f44038c74b368d2947ea9.pdf?index=trueIn PDF document text
    • http://durakukulutozar.epizy.com/how_to_take_lens_off_mamiya_rb67.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb72a17-49cd-46bd-87ef-119a85851db9/xijuzamobosusekul.pdfIn PDF document text
    • http://duwugupexajas.epizy.com/32731802939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0a0628-8953-497c-8362-549d06b6b2c0/41268691721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503d4e1d-e2d9-4829-bd45-9e051b9104d6/secret_agent_training_year_2.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_06fa61619e624490a250b6cfbdba928c.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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5328 bytes
SHA-256: 225a60f3e24c72a88cb17a43bbd2ca6762a5695436abfadc50601078d6023340
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 2464 bytes
SHA-256: 01d89f79120567c851dea0caa5b5ee7547c8211069383f1d59f8dd00f92a958c
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 12476 bytes
SHA-256: 75caa7b574acc63cb5ee84e8a141e6a6213fcbf34c2e081d3afb4785f6a7db55

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