Malicious PDF — malware analysis report

Static analysis result for SHA-256 a623bee52fb7a584…

MALICIOUS

PDF

74.9 KB Created: 2021-02-13 08:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31f15150828b0cf64063656296f51b48 SHA-1: 43f3761a3013740df0fe94d2d515a3b98d84b0b6 SHA-256: a623bee52fb7a5840595311183bf7b2d53bafade7580d46a9ef44514e3cb1275
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains a large number of external links, many pointing to disposable domains or URL shorteners, suggesting a phishing or SEO spam campaign. The presence of embedded JavaScript, though not directly analyzed for specific malicious actions, is often used in conjunction with such link farms to facilitate redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/aws?utm_term=can+bus+super+sniffer PDF link annotation
    • http://kersita.space/mezefugewadabogipexorii1nhq.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/jhihhdT/download_video_from_instagram_link.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/letijiganerupozeve.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/b649c0d.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/jf9a3On/queen_the_greatest_hits_platinum_collection.pdfIn PDF document text
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/luzapijikorokefisipu.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/c6Zgjyf/big_baby_tik_tok_name.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/gjGegih/nike_icon_clash_leggings_yellow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_602422d635a48.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/X5ehc8r/hachi_hachi_el_dorado_ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5fe95d08f124b.pdfIn PDF document text
    • http://extrameets.fun/6280754472wexms.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/3947054.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/hahghjz/xtreme_vr_maze_horror_runtime.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/MLgfigL/vokim.pdfIn PDF document text
    • http://esplus.pro/bon_jovi_live_in_london_freed25md.pdfIn PDF document text
    • http://frut-tree.site/bonugakedn2vku.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/1846101.pdfIn PDF document text
    • http://topstudy.fun/zewatiebio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5ff75f1913bb3.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/3f4a3bce68986c.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/aiiagQ8/kufekasipalib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 4908 bytes
SHA-256: ae8efb227e058b29964dedd17606edeb3a8c102e813291c5960240bfd10d48c8
font_01_sfnt_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 11688 bytes
SHA-256: d7fb90cad8b9e847bba6074bd14b4ef4f954b7f50f8b9f7cb4febfd71774d458
font_03_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 2548 bytes
SHA-256: 6988c129779f8217513c5b1550b3ffa641a22c136a9e8a84bc0744583cfcd11d