Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e41f967b99517c2…

MALICIOUS

PDF

123.7 KB Created: 2021-05-29 08:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 771eed2b2cefa97e82550a514ba01176 SHA-1: 1f25da01fb2578f7eb2f6b303e0a1e74f9022e0e SHA-256: 4e41f967b99517c2a898c12a07c7d9b8593d33637ea809a06df551ce7687a792
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=pathophysiology+of+stroke+pdf PDF link annotation
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/jesolunekatoberakel.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/135707.pdfIn PDF document text
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/kutufagizikaf.pdfIn PDF document text
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/2c58f3fe546ffcf.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/e2e0041ab747.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/wamogowupategi_pevugik.pdfIn PDF document text
    • https://xupunidumurewes.weebly.com/uploads/1/3/1/4/131437359/6a977de1.pdfIn PDF document text
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/ff8be3b03ab.pdfIn PDF document text
    • https://gixoloxivut.weebly.com/uploads/1/3/4/0/134040336/c278be17.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/a54f367e9c.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/2727a0cfe.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/9021163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7abd306-75c3-49e7-9161-cf8b06702145/english_grammar_and_vocabulary_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4723702f-2081-4fc8-99b9-25f1347ed5ac/how_to_connect_merkury_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97226e55-a81c-4152-981d-f0d815abeaa0/dezukesuwabikiliwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40670456-e4ff-4c9b-bd3a-3aab745c7b90/perfect_puppy_in_7_days_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b003fb-f016-44ef-9222-edc893204cb9/urdu_funny_poetry_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b14ffb-f52b-4111-8b2b-84ec16b16d37/22177318187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65bc8a7-35d9-4659-af23-2779cffbbe64/samsung_un55ju6700_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31343efa-7a61-4537-8a28-82e06e2e1455/81212662518.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://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_off00018eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAA 5468 bytes
SHA-256: e9e5fa29af9227f1cf91e93b1353ffc82f2c318c5221478df1ccf09c99548d05
font_01_sfnt_off0001a147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A147 12904 bytes
SHA-256: 2e0b90e619abb44839ed5d3f4a8b3a4aef98c2c64269ca61ce17d0741442c657
font_02_sfnt_off0001ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA25 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7