Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d7d623ad2103bc…

MALICIOUS

PDF

78.7 KB Created: 2021-01-12 11:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1456151bff4651f580d4871c912aa80d SHA-1: 5201a163854e565631481c2c366dabe06fd24f1b SHA-256: f8d7d623ad2103bcbc1a2d4c416c69840c11b3a3f6b59bfb5aeb906173cb50e9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure suggests it's designed to drive traffic to malicious sites.

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=latest+blouse+back+neck+designs+free In PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/photo_gallery_hd_editor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f95467e3c4fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8a6c1677dff.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/gupugonomaziposetixazagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fd077c886413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fd938d44d359.pdfIn PDF document text
    • https://site-1175531.mozfiles.com/files/1175531/jadelifalexofokomu.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/VmYyVhR/the_expanse_season_3_episode_6_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/kZ5jf07/top_5_battery_charger_manufacturers.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/6hgib77/botelapanugerofi.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/ifgfWjf/catch_up_coverall_bingo_gamesville.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/fjcjaVW/65753092677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5f91c18e1e653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fe5f0c2676e6.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/1179718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 5336 bytes
SHA-256: abf22ae37b69fb9aca388b19de404f2c0c5d939ab48f57577984c2a0a70acabe
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10184 bytes
SHA-256: 9b785a0b29adacc62c25f401fdbf4639723923fa0cc84df0775fc7b68255487c
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 4240 bytes
SHA-256: a6138f45473810e9419ec8a2e302101ada3458853c2df4c46551cdcb272cd6c6

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