Malicious PDF — malware analysis report

Static analysis result for SHA-256 1add0821c1c9c1b3…

MALICIOUS

PDF

75.0 KB Created: 2021-04-05 10:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 543d2f7aab3df92ecacdfeaa1be37be5 SHA-1: 5b39c262dcc900c662f65fb87f19238afa5ff10a SHA-256: 1add0821c1c9c1b3fc30a7021e39b5f0f098aa731414307f812dcdace49004db
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 0.9997

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://gimoguvi.ru/123?utm_term=vaksin+avian+influenza+pdf PDF link annotation
    • https://cdn.sqhk.co/vewukiziwemi/a2gchg9/povizuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/5ghVOjl/belenipoke.pdfIn PDF document text
    • http://sinomefonok.mywebcommunity.org/passport_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/sovebiba/gVecggU/15584314165.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/sabimi.pdfIn PDF document text
    • http://dapajibidamazed.mypressonline.com/food_costing_formula.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/revista_capital_humano.pdfIn PDF document text
    • https://cdn.sqhk.co/bokapapukopa/hemIKld/panic_alarm_system_in_car.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/XZjhibj/sssniperwolf_videos_made_today.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/sizofawimeriwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/event_planning_website_template_wordpress.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_cca3a2e297844c749385a90e54d03559.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_8db9394558e54587b59ff83a7db7b600.pdf?index=trueIn PDF document text
    • http://namezenidel.onlinewebshop.net/53658238949.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/85032465214.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/35552933437.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/34663597752.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/sesidabe.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/18072130645.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/73431964055.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 5076 bytes
SHA-256: 4927465455e2bf4c4483517ac24410ded79be47a58b2b11649a6b0573615ab7a
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 10216 bytes
SHA-256: ba34d9be1b07122aec8c57c6d47c0fa9253d905c800ae2ea67acc1345d97e23a

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