Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cd1bdfa6993586…

MALICIOUS

PDF

86.9 KB Created: 2021-09-23 22:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b51e7b17aedb0802d4917171d2ca458 SHA-1: 855d62c957ae19a4d6876cd4f762a58b3f6a2f4b SHA-256: c6cd1bdfa69935860cdb388a16e0b00f8aaa09a55e9badcc59bb1f7db0dedcf0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating malicious intent. The primary malicious URL points to a PDF file hosted on a suspicious domain, likely serving as a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tfn0eai3a2ap228b4cp2na5nb6/givemisasoj.pdf In PDF document text
    • http://villalapinetafavignana.it/userfiles/files/tafur.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/kp65mcm8d62csl9h91bram1mui/rerinosonir.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31851086978.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/37556854152.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/paludefilifozixirev.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210923_091125.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/pupufibaburiwapuvexisu.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/pevurovuwuvow.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/vimaremugedazidanig.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/89872323033.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/wasotalofapa.pdfIn PDF document text
    • http://slsnn.ru/content/files/kasasoredovokepatedina.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/wejobe.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/86702115682.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/10935179182.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/48008368864.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/sibosepamojajevevaligudik.pdfIn PDF document text
    • https://migger.dk/userimages/file/vujonevepulet.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wilakaxufuzomafi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/80052999691.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/69279076055.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/noduromizemikawokedurebur.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/95908576702.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/fiwisuzowigizuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=where+can+i+watch+fifty+shades+of+greyPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 18452 bytes
SHA-256: a50b6ad15b3bd126671932f2bc5311f6cd23cd4466e06105c3738e26c559957a
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 10904 bytes
SHA-256: 5784dbd35e85f4038ed76dd23f36a9a22f17507ca5322d12cf3f0b55bde7ac7e

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