Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a463c2f96a5d6db…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 11:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d40245ac60af4f104b3723aadc45c0f9 SHA-1: 409b8e333ddfc814b7b1c5814be97f80928bbcf8 SHA-256: 0a463c2f96a5d6dbd777232f829f1e6027b8c1611c2973d3393fb14053e98f88
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable domains and CDNs, indicating a link farm designed to redirect users. Heuristics like PDF_RANDOM_URL_LINK and PDF_SEO_LINK_FARM strongly suggest a malicious intent to host or link to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/strik?utm_term=old+yeller+book+plot+summary PDF link annotation
    • https://cdn.sqhk.co/pesenexur/bOqhh59/redekepezivufotases.pdfIn PDF document text
    • http://strgb2.ru/cours_arcgis_10._52xu2h.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/chdaEGe/62539081163.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hgdu59d/mad_dex_2_mod_apk_download.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/a3170dc390.pdfIn PDF document text
    • http://hermidkovo.info/73640713502brh7u.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/naxugerawekenejemise5a94o.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/G4jbsOW/by_the_sea_movie_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/rupizabiweze/5Vifjat/bengal_tiger_video_songs_com.pdfIn PDF document text
    • https://pozajuraxox.weebly.com/uploads/1/3/4/5/134591712/posukebapusuk.pdfIn PDF document text
    • https://zoladawa.weebly.com/uploads/1/3/4/1/134108991/besuxosejedot.pdfIn PDF document text
    • http://vk-settings-change.online/24958100003gls40.pdfIn PDF document text
    • http://parkingtest.xyz/381727426814ijsg.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/a001bf1b0df.pdfIn PDF document text
    • http://shortsomfj.space/how_to_thread_a_brother_sewing_machine_lx-3125xgrdh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojosatu.epizy.com/79454413891.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/66291765669.pdfIn PDF document text
    • http://veroxeron.epizy.com/why_wont_my_panasonic_smart_tv_connect_to_netflix.pdfIn PDF document text
    • http://besoxumewube.epizy.com/raliwixozu.pdfIn PDF document text
    • http://nivitigu.epizy.com/callus_formation_in_bone_healing.pdfIn PDF document text
    • http://regojefef.epizy.com/64764043914.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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5440 bytes
SHA-256: aad55b708555d8d29dcd0174ded24c4c9aff7ff6511f15f134c9a4aa704fec4f
font_01_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 11856 bytes
SHA-256: 329977247a38511bcaa2558ff6316693e9f06af93da87bd446160a7d9d6860d6