Malicious PDF — malware analysis report

Static analysis result for SHA-256 a348cde7ca908991…

MALICIOUS

PDF

80.7 KB Created: 2021-05-16 09:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ebb23521f63f198daeabdecc75758712 SHA-1: eb3ef671ea28e0b806441354d2c6767d44510fb2 SHA-256: a348cde7ca908991376b4773712334d1266a36d1d9c35c6fb069dc47add25c12
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to benign-looking PDFs, but one primary link to 'midufefew.ru' which is likely the malicious destination. The document body is heavily obfuscated, but the presence of external links and the overall structure suggest a link-farming or phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://midufefew.ru/strik?utm_term=what+is+the+ideal+height+for+a+table+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6065f1cebde45.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/revised_child_anxiety_and_depression_scale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fceefef3d6ad.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/books_of_pastor_chris_oyakhilome.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/98587579454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/kalulawomufaxaretasaxago.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/anthropology_writing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/english_placement_test_practice_for_community_college.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/arduino_micro_r3_datasheet.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/the_tale_of_peter_rabbit_book_collection.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_ac1970f45f23431d96c3c1c530a5da35.pdf?index=trueIn PDF document text
    • http://xifimerin.onlinewebshop.net/chinese_language_beginners.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/59983680267.pdfIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_13e60d1284d9443c81d5356ed4650d51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/baxopujofafu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/12444701087.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/shirt_template_back.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/74090658122.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/telopelobonolurebav.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_17e0a14e2d6f4ba09c1f8685079dd857.pdf?index=trueIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_97e37beb0295458099e17c45b3497fce.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_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 5416 bytes
SHA-256: cde2819ec0e3b5aeff861b82aafde6649aa7b93637d3e4adbd70de9964b14075
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10688 bytes
SHA-256: 95dd44976c9636648e68f95205e6eb6c61281f74b98f55a88eb00da70aa969dd

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