Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331fb95c08f082b…

MALICIOUS

PDF

72.5 KB Created: 2020-11-26 15:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 45e85c252dd27055b001e0db2d2bb39f SHA-1: 5435df355bcbf34dbf3cabe2dabd1d6ec0091d2d SHA-256: f331fb95c08f082b9396fb21b9a0c375bcd1c05cfa9f4135c607d58269d23a0e
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with critical heuristics identifying it as a malicious redirector and a link farm. The document body, though heavily obfuscated, contains text related to 'Asphalt 8 game for android', suggesting a lure to download a game. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=asphalt+8+game++for+android In PDF document text
    • https://ratomewupevo.weebly.com/uploads/1/3/4/2/134234569/2b44aa9.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/pakorasomusovigi.pdfIn PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/mubov_dobuzuz_potirena.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.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/jazuravazaguz/risuzen.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/95781044115.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/audi_tt_forum_buyers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/appareil_de_golgi_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/avast_antivirus_2018_exe.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/kexafite.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/jacoco_report_not_found_jacoco._exec.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/58061804859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cd8f99-57b2-463c-865a-20ab99932b76/hunger_games_book_1_name.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/mevuzuwukoxopabijida.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_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 5424 bytes
SHA-256: 0e66f09560df4c2965ddb5439d0d0e4e75c4ddb92dcb415c1cbb89a737110777
font_01_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 9940 bytes
SHA-256: 4abee0573387ec2e6c90a438a1a8e502c4da369b11b482c5197fee37b94dfa24
font_02_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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