Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8d869214c353ad…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 18:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e674451d6276dff1b9078c3ed38e0223 SHA-1: 546985c18ea41c9b1d1e7222ec174748c693adee SHA-256: 3c8d869214c353ad3996d0a4933b3a18279b4802c354de5a445108179e4d56aa
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to PDF files on distinct hosts, and a heuristic firing for a 'link farm' suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://visusmarble.com/images_upload/files/97481914832.pdf In PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/golofo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/3015997491.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/96728830434.pdfIn PDF document text
    • http://orem.mn/uploads/files/tiribuxonogugibamepi.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/52992578724.pdfIn PDF document text
    • http://sissonne.hu/editor_up/63238127782.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/milewaromotazupiwevirika.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/7825681769.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca809d88a7---judodapapeko.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/50701500607.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/liwulomavawefotapepad.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/51049365347.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910013609.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130e606c9fcc---20891008065.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/99615625916.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/sajesikajuzederomopus.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/gozexipesojokoziloviz.pdfIn PDF document text
    • https://tekmaker.com/upload/files/74583762939.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/44235984988.pdfIn PDF document text
    • http://guowangcable.com/d/files/wanoraxitujixez.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/juxezak.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/ratelokenupiduteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nox+cleaner+androidPDF 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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 17456 bytes
SHA-256: 86c2addf09f70202d69f9f06532f615e4c5a31cfe134a973713d2042f76605fb
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10176 bytes
SHA-256: 05c28c87cbbf6bac2f00b4cc888d52cc730474bad3d410c292bc64b2327433bc