Malicious PDF — malware analysis report

Static analysis result for SHA-256 da55e493ec39dc8a…

MALICIOUS

PDF

71.3 KB Created: 2021-02-17 12:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: be838d24eda5e2e12ed1f91c97e25e1a SHA-1: 5b9ec18d888fe68712d23dc82958dc0f697f16be SHA-256: da55e493ec39dc8a18f5791fa1218cbffd364d4897acd6bfc4f5b205f694cf5f
126 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 or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://jacksth.ru/wix?keyword=junkyard+tycoon+cheats+deutsch PDF link annotation
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/mevanowimew.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/madodiju.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/7b2228b.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/19333116927hp25x.pdfIn PDF document text
    • http://giocodigital.fun/34785458660d3rpb.pdfIn PDF document text
    • https://wojulifurezusek.weebly.com/uploads/1/3/1/4/131438898/6980215.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/7JjbjKZ/puppy_wallpaper_hd.pdfIn PDF document text
    • http://technodom11.com/to_answer_someone_back_meaning5liq2.pdfIn PDF document text
    • http://mitefakosutupot.22web.org/bitlocker_to_go_mac.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/8408677.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/hejheij/jabejufizabuwawolov.pdfIn PDF document text
    • http://duplicwcnj.space/miwonavotozigapokadujitigzkcri.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/vudejawunuvigijusuvu.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/graphic_design_australian_style_manual.pdfIn PDF document text
    • http://nout-sale.site/nirowaboxanefuxefofu3keu0.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/97e8679046be.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/bPDJZ8U/86870092635.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/palevijuj/what_is_the_purpose_of_literary_criticism.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/arrow_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/jokejiwedujevabized.pdfIn PDF document text
    • http://debatebarumexa.epizy.com/bulk_insert_format_file_xml.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/arabic_consonants_and_vowels.pdfIn PDF document text
    • http://kusegipe.epizy.com/71628464936.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5152 bytes
SHA-256: cdb249eb40330bab26c9c6545ba907a48f85da27e05dc9cf43df7b4e44319f5c
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10500 bytes
SHA-256: 8d16a60e96299fb7315be869f2b4c1fed773db640abbd59204331c2d8f6c8d12

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