Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1c21350285792b…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 21:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5464c171bfc25e544295f998599ddfa6 SHA-1: 2058505c0178575bd4a75f05d58ea06585788037 SHA-256: ac1c21350285792beed9bcd42c5600edd92a0d7fd1556802504d46e6afef94b3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a potential for JavaScript execution or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/aws?utm_term=the+princess+bride+book+and+movie+comparison+essay PDF link annotation
    • http://znatural.space/quete_principale_wakfusrd6k.pdfIn PDF document text
    • http://usene.xyz/how_to_crochet_a_beginner_beanieqwnbs.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/yUheLWk/coupon_barcode_scanner_apple.pdfIn PDF document text
    • http://rumagadoli.22web.org/89015561330.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/jgilLZ0/lupekonanamuboxomakanos.pdfIn PDF document text
    • http://mp4.design/455875683969cnou.pdfIn PDF document text
    • https://gewopisoxow.weebly.com/uploads/1/3/4/3/134306678/2038123.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/iioJieI/44986592733.pdfIn PDF document text
    • https://cdn.sqhk.co/buweworipoza/BEhfLjQ/94953744416.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/cMgeghA/rock_and_roll_classic_music_please.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/cmhdCzR/phoenix_weather_december_average.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/fijFhbD/kiserixukomabomon.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/Rf4tifo/vakoxujuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/Ngeknif/nikat.pdfIn PDF document text
    • http://rineset.xyz/5222757447j4y34.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/01jdfin/auto_tune_8_free.pdfIn PDF document text
    • http://discout.online/cha_cha_chat_appqfho2.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/12392386a79ab.pdfIn PDF document text
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/fesegogu.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/fhi2ijr/cat_population_by_country.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/mnghAge/83401398097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirerig.epizy.com/99080254817.pdfIn PDF document text
    • http://zinamasab.epizy.com/31696833996.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 5596 bytes
SHA-256: faf5fcbef1576b25fb1b148e72538119664ff6429f491efddfe042cb4ae46d3b
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 11568 bytes
SHA-256: dea432cda4dde926dbcb9ff69d166b2e5ac42131345504fc001d52fa5584630c