Malicious PDF — malware analysis report

Static analysis result for SHA-256 682db52dd2b083c8…

MALICIOUS

PDF

112.6 KB Created: 2021-01-25 04:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e040f11a409efa0c4c134c778730307f SHA-1: 1a53656ff2c29238a5bbbf338dd2849e88d99ed3 SHA-256: 682db52dd2b083c8694d8d9691db00ed38e12abacdeb580dbfe62098844a152a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a distribution or phishing campaign. The presence of external URIs and the link farm heuristic indicate the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=4-4-0+locomotive+pictures PDF link annotation
    • http://micrometer25bill.site/super_mario_run_hack_free_downloadsvemh.pdfIn PDF document text
    • http://dayzcommunity.info/sims_4_cheats_skills_childtbvtw.pdfIn PDF document text
    • http://yourcy.com/dairy_free_pancake_recipe_for_babiesjt7x2.pdfIn PDF document text
    • http://just-gopro.com/stock_car_racing_experiencexjb7k.pdfIn PDF document text
    • http://uablog.website/709716781687qqb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe0b09e50953.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/ffahNja/wekitemojapoguzajizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425916/normal_60077045ce786.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jaiilih/pavut.pdfIn PDF document text
    • http://saxamem.iblogger.org/54315172141.pdfIn PDF document text
    • http://arenaprobet.com/star_tribune_covid_deathsvijht.pdfIn PDF document text
    • http://buytoday.cc/best_quotes_for_fb_status_in_englishx9otp.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/Tafric3/86741781055.pdfIn PDF document text
    • http://strapslap.online/53868229230rni3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://donixug.epizy.com/pinutizilolukupibapakez.pdfIn PDF document text
    • http://vipebajivakal.epizy.com/vampire_the_masquerade_5th_edition.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 3004 bytes
SHA-256: 65d8601e2e294cb7135f82b01b332919810204dd50310348fb344465d3706304
font_01_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 5096 bytes
SHA-256: bb4bebafb0e18edfc4d1d0e52b0719d16f11ffef5c03421357d018c128a47259
font_02_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 20912 bytes
SHA-256: 1f113c4dd90c97ddfdec5f3f7397ebd26b704bc961cbffe9be99bd5934ce11f8
font_03_sfnt_off00016981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16981 11656 bytes
SHA-256: e02c18eaa6242a73fe163901d1c2798b857d4e92caa80e665eaa191d414e9849
font_04_sfnt_off00018fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEE 16084 bytes
SHA-256: 28ea8e33835c18ed4d5e5c8a80df3d4ff8bc9a8f87ed320a16cb83e06494c971
font_05_sfnt_off0001a49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A49F 6084 bytes
SHA-256: 0c3766dce408445f50e904d652c9326647873efe4fb22fffa238fb744f3c79a9

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