Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aadcc8845585ea3…

MALICIOUS

PDF

86.7 KB Created: 2021-04-05 11:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c34edaea59d25802e373b0c3028ffa7 SHA-1: 878b0f4b89bd66449e8d768a710013cd782cfec1 SHA-256: 8aadcc8845585ea3589260dac875721ae82f49d5b5d2567e7bebcb0a7cc08940
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9981

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://midufefew.ru/strik?utm_term=mainstay+metal+arm+futon+assembly PDF link annotation
    • https://tavasosezirom.weebly.com/uploads/1/3/4/7/134768566/dd939e3f9.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/3058361.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/1000372.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/bavimineleke-bubusal-jivitezi-lokugadurasa.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/munesepafekikasosiv.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/3981779.pdfIn PDF document text
    • https://mivagori.weebly.com/uploads/1/3/5/3/135318233/7590011.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/9196307.pdfIn PDF document text
    • https://wegizazuxiri.weebly.com/uploads/1/3/0/8/130814830/xeraratuto.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/25727132053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotilijiminariw.rf.gd/logemirudoromizagupux.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/bio_medical_waste_management_rules_1998.pdfIn PDF document text
    • http://xeziredo.epizy.com/column_chromatography.pdfIn PDF document text
    • http://fifomivosa.rf.gd/javascript_date_print_format.pdfIn PDF document text
    • http://nonivomiba.rf.gd/sodoreposolekumasotefinix.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/bawoke.pdfIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_71787e35ef464f5f91b9ad33b31ed1e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/94803272905.pdfIn PDF document text
    • http://muputuxu.epizy.com/bixijavobosapotunotix.pdfIn PDF document text
    • http://diwekudajon.epizy.com/value_investing_books_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/55966489995.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_77a0e8db4ce54e598be947778ad8925a.pdf?index=trueIn PDF document text
    • http://sewekovekejir.epizy.com/solving_radical_equations_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/naxifobejedafon.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 5160 bytes
SHA-256: 0f1b30e104b90c0bdf4cf96ddb214997af98d03b6f022381fd0883dceccc14f9
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 10492 bytes
SHA-256: 48a79a209136b093e40a7c03133b9c82023ee9302eea369ddb7d9d804f4260be
font_03_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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