Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b05134cab706003…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 15:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a5147a69c827e129aaa9a9c1810a078 SHA-1: 762a098d4aeaf1ebdda7994d802c4ab582f2c2dd SHA-256: 6b05134cab706003c8edde41ce3b46d78987dc847c1af54c5cf80d6ab3dacf4a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION, indicating a high likelihood of malicious intent. The SE_CALLBACK_LURE heuristic suggests the document is designed to trick users into calling a fraudulent number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=how+to+not+sync+contacts+from+gmail+on+android PDF link annotation
    • http://progettarecasa.com/userfiles/files/21638117549.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/81720047016.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/1672013330.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fulibalotomavijakuk.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a55630f02---36799089393.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8744866687.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kukamesajuzuvo.pdfIn PDF document text
    • https://anakmeong.com/contents/files/vunovebudil.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xaxamokimewu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/15557401013.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/26202142012.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/jizasigowuwek.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/tixarumara.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/55768874837.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/85662316287.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fexilite.pdfIn PDF document text
    • http://patroha.hu/file/44061935141.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/88277326857.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29506127790.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/26647944175.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/konami.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/58214231705.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/47518807889.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/mowopoxon.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/93676517482.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://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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16892 bytes
SHA-256: 9dd381006fb9b911d04d8382c3b7c3139986e1952aef076c7ccd075280bd9c17
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10880 bytes
SHA-256: 9d9deedfe49798b97c4ef167c059491db166d5cf8ee5d49ec1c8b543fc5a8657
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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