Malicious PDF — malware analysis report

Static analysis result for SHA-256 47181249a25c8cf1…

MALICIOUS

PDF

81.0 KB Created: 2021-02-24 16:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 012c7977cec501a62407ef6ddad74ead SHA-1: ee34a0ae24cf0ec3ac389c2fcf3817df99507cb7 SHA-256: 47181249a25c8cf1d5364000421aa50d195a6b533c558b961d51f2c7c174d1d2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDFs hosted on dynamic DNS services, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to search engine optimization keywords, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=how+to+block+someone+on+hotmail+on+ipad PDF link annotation
    • http://golixudib.mypressonline.com/53811559933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ff75f8daeb07.pdfIn PDF document text
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/fuxadigelafegi-muzipo.pdfIn PDF document text
    • https://bafijesepuj.weebly.com/uploads/1/3/4/0/134041147/5470879.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/3271630.pdfIn PDF document text
    • http://leledup.mypressonline.com/is_wendys_breakfast_sausage_pork_or_beef.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/72400232838.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/744762.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/what_is_my_love_language_meaning.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/listening_comprehension_activities_for_6th_grade.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/42ddea3885e2.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/276775.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/wufagulelewer.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/6655694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/libosokune/marine_weather_report_cape_cod.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/51383380048.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/41508251785.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/emulator_android_ringan_untuk_pc.pdfIn PDF document text
    • http://girofili.myartsonline.com/is_nikon_d3400_full_frame.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 5260 bytes
SHA-256: e6d0844fd806ec7644a85a610c1566d064b572ef417e258943e02eda33cd5259
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10316 bytes
SHA-256: b7a3ac6299a1563118a617a4aa24afd332c22ff4a7cd89f65de5bec47b4b7865
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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