Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2da43691897f47…

MALICIOUS

PDF

92.3 KB Created: 2021-03-01 02:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a874b73065c3f34442bc448ea66afb1 SHA-1: 0474d5b76c3c0fc85ac462aaf886854e0de089af SHA-256: 3c2da43691897f47245227770459d625f3ba13f1fc52ac7490b0e32c15bba009
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly the one pointing to dafemum.ru, are associated with known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to these external links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://dafemum.ru/123?utm_term=hansel+%2526+gretel+bakery+cafe+-+duluth+pleasant+hill+road+duluth+ga In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_601d4ddfbabb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/9Hhhwia/73280015100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60209d0960cc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5ffe73200a45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5fdc48f8d9e1f.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/kemob.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/XewW7lQ/stickman_the_flash_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/ehboqjd/nintendo_3ds_xl_puzzle_games.pdfIn PDF document text
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/vigosuvemanoku-baselibe-kixaxo-dulugujufid.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/20783601182.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/gdiigfh/jifegazenugibamek.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/lajadibinubu_kalarewawegovot.pdfIn PDF document text
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/eacce8656b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekusisit.atwebpages.com/california_cooperage_hot_tub.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/joel_goldsmith_infinite_way_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/kedebaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/easton_hexx_arrow_spine_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/jadivovezawawedovaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/baxudajudafobelomonur.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/7561587512.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/nokomomijogasodiw.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/developer_tools_chrome_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/brooklyn_nine_nine_season_6_1080p.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 4540 bytes
SHA-256: 5043ecb52d45b263c80fd5ee50911cc0eb11d6cd1d858cb11ce65213a23b53be
font_01_sfnt_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 15184 bytes
SHA-256: f3299ca7e571924cbf4febec83a144c9232a13baf2b0dd629869d66b375f3be5

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