Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed3d8580ab03f6d…

MALICIOUS

PDF

88.7 KB Created: 2021-03-17 02:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ff5f2ae6b19683d15d57ad44b934f3 SHA-1: dc803185d978e00eb27b8185853a9172216f4be2 SHA-256: 0ed3d8580ab03f6d7857cb5f95774c995d52df1080977a302ce69323a34b2469
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS and ClamAV detections further confirm its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=aptoide+apk+minecraft+story+mode
    • http://tesar-krd.ru/vosezerazexikixipovazkxv3x.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/0f53ae8.pdf
    • http://masajsalonunuz.com/6278709061949tck.pdf
    • http://okrasote.info/nursery_coloring_sheetsinsgp.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/xuwux-pazesefesababal-vuvudepimu-pivosefeburati.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/damejupewen_morifugufama_fudiw.pdf
    • http://xunajoza.22web.org/jotenovirulexuderi.pdf
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/roterepimame.pdf
    • http://copyrighthelpcentral.com/wojizefahfrym.pdf
    • http://vezdesami.ru/rikalumuzec4cq4.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05ac815f-6769-496c-8c9e-4b1c5c598449/nutewutemul.pdf
    • https://uploads.strikinglycdn.com/files/b34b37d2-7493-4395-891f-61f35b618d6c/complex_carbohydrates_list_for_diabetics.pdf
    • https://uploads.strikinglycdn.com/files/aee20888-0ec7-41c1-9061-811bfef505eb/hoover_windtunnel_3_vacuum_reviews.pdf
    • http://golukotekitu.epizy.com/39577437319.pdf
    • https://uploads.strikinglycdn.com/files/7c796138-2138-4374-96a9-0b65d8ec876d/emperor_clock_451_050h_manual.pdf
    • https://uploads.strikinglycdn.com/files/7f3cb569-7b41-4f4f-8b37-683d49bf221e/my_foscam_wont_connect.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010395.bin
cdd60b851bd321e05abc95ee184f8a712c83d16f22e460d652c36a0f784bdbc3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10395 16204 bytes
font_00_sfnt_off0000f12b.bin
adc73f2622a886b7cb88c447986abc8a2caad6a4fc645ed3b076d39437fa9f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5424 bytes
font_02_sfnt_off000130a7.bin
d08966b45793f0e661d5b61d3bb1c71d03b2c967e1b9ebe41d2a8aaed33b3172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 10344 bytes

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