Malicious PDF — malware analysis report

Static analysis result for SHA-256 724888bc9276ca18…

MALICIOUS

PDF

67.8 KB Created: 2021-04-05 03:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 6245b75bba8c4957700dd201b372d429 SHA-1: 399668a77d2889691fbe53758e71a51ab77f570d SHA-256: 724888bc9276ca18ee583abc27c1dde1889ad3cc06d2dae2c4e2a96d0727cfd1
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URLs point to domains designed to host or redirect to other malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://seumenha.ru/award?keyword=o+the+glory+of+your+presence+chords+pdf PDF link annotation
    • http://matawobedopikam.mywebcommunity.org/mibowaj.pdfIn PDF document text
    • http://xiguzot.22web.org/97493362298.pdfIn PDF document text
    • http://jidameke.mypressonline.com/grimani_breviary.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/jgifgjg/tumawag.pdfIn PDF document text
    • http://gutunesurozubub.22web.org/24373234127.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/hbgdD2q/48300837526.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/8oKLhes/39001789627.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/difRYha/challenging_problems_in_linear_algebra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_cb3ec9487c7842e9a77e16eb2484afed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/jupepa.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/let_s_learn_english_book_2.pdfIn PDF document text
    • http://kilobawul.rf.gd/political_map_of_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/62710257930.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/diablo_3_seasons_leveling_guide.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_b21c4c753c68447bbfeffae742d33ea2.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 5336 bytes
SHA-256: 81b2f0c3244632d1fdc01d1802f65502e2586d899afc7e6ee0cf770169456eb5
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10504 bytes
SHA-256: 1b19ac5d8ff4e976d7168c402cf54ce6e0ee36060eb33947e1b0b10c563e6bbb

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