Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c795e2cfb464708…

MALICIOUS

PDF

75.1 KB Created: 2021-01-14 10:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 49972be53c186f19aade33fb205e4113 SHA-1: 232a5c901bc7d9ccc3f15409293183e203b0378d SHA-256: 8c795e2cfb4647081f5edfd49b847474301e1fa6acd07bdabc69f61fea022594
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, alongside a critical firing for a PDF link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate a high likelihood of malicious intent. The primary attack pattern involves directing users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=janapada+kannada+audio+song In PDF document text
    • https://site-1172519.mozfiles.com/files/1172519/womuv.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/kuxatuwizovu_memomuvisigeba_biroz.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/MHRjdhd/68488412520.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/nivodike-rososazavenax.pdfIn PDF document text
    • https://pakidezosatujij.weebly.com/uploads/1/3/0/7/130775723/8000078.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/a4f10e5.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/ligiki_jitebulezawez_ketepewiparigiz.pdfIn PDF document text
    • https://site-1178112.mozfiles.com/files/1178112/tubaluzuporovi.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/qumica_inorgnica_shriver_atkins.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/skype_7._59.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/offline_dictionary_english_to_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/ea_sports_badminton_game_free.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
stream_003_off0000de61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE61 8956 bytes
SHA-256: ab21e5b671022eaab61fb7c595d36374cbabf4bace3ef250ba0d9861add02b9e
font_00_sfnt_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 5052 bytes
SHA-256: 456e3400a2a7c70dfd004e8616b3c38c6f5625fbee07f7e28415f45b9ec8d3b7
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 12248 bytes
SHA-256: ed73cdeae69da558badf7b12d57fc62cf1b2cec4769a4b2e8809eba1661dd6d7

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