Malicious PDF — malware analysis report

Static analysis result for SHA-256 f607306656080c17…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 14:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c9572f29dfe01d9cae14472e272c7c5 SHA-1: 7769e187bd8757d93d1da308c6163c58c5dde329 SHA-256: f607306656080c17ed35856832680f103c57a99bace166e36f40381cd8745b4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to manipulate search engine results, likely to direct users to malicious sites. While no executable scripts were extracted, the presence of numerous unknown URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://transilvaniafishing.ro/app/webroot/files/userfiles/files/41695338657.pdf In PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/narorumaregito.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/83464086019.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tawixuxiru.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/sawusivomekakugosilowiwu.pdfIn PDF document text
    • https://reniuved.it/file/ralurivuvejurilenovunigi.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dugotizixoxeweluwulalu.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/refases.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/xaranonibonufixewurir.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/felojupasafasini.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cc959c96---72343658103.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fudativojodapawepewoji.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/87378577249.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/27465435891.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/42033712762.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/vebozofu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkkmnu16reumtn73u3q2sjjo1q/vefoluxefuba.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/45654552768.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/laluxudularotefawogi.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xagufuf.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/70502112744.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kolobisojuwoxos.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/lazemufaxenuz.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vufesos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=difference+between+an+android+and+a+robotPDF 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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10480 bytes
SHA-256: fa8ad54d0c3243417482676a41f6a1fd9ed7ac1c892d9e74d5a73eb070a137ff
font_01_sfnt_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16512 bytes
SHA-256: 28fda6b3a13772436c3eb0b2f66cb24e668849def3259e0d0ae183318eaa92aa