Malicious PDF — malware analysis report

Static analysis result for SHA-256 f531d98d56c20c26…

MALICIOUS

PDF

86.2 KB Created: 2021-05-15 11:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbaaa9f96838409f80161ba7a0ffe49f SHA-1: 9f32c4276d68e290a1564a3b591f5a2a24529884 SHA-256: f531d98d56c20c260cdd68b7b88f8901cca578e11970715999a46a8220639e4a
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/strik?utm_term=doctor+sleep+movie+stephen+king+cast In PDF document text
    • http://visionnew.xyz/11507670402jed0p.pdfIn PDF document text
    • http://azorocheat1.xyz/xuvugq2tct.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/panasonic_cordless_phone_batteries_best_buy.pdfIn PDF document text
    • http://operationhomeplate.com/55101643146mds0q.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/51401499135.pdfIn PDF document text
    • http://esclick.pro/htc_desire_eye_battery_removable_or_not9nwja.pdfIn PDF document text
    • http://webpost.pro/43436747879b3jxv.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://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_6d7521937cad42e6b1e07ef322f4ef8c.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_538917fc00364da88aeb75dc53532e83.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_0aaeea03897b486aa5c01cbdded6aed1.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_ca8463c395304606bcb1dcb2c45aaf5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/vatufumed.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/speak_now_1_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/briggs__stratton_725_exi_series_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/66164500186.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/13135493403.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/92077229106.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/27123873069.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/well_noted_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/free_yahoo_messenger_7.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_6b5b115b1df0495cb16eaaf55c85dd83.pdf?index=trueIn PDF document text
    • http://pazepoxi.atwebpages.com/canzoniere_scout.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 3136 bytes
SHA-256: de47db92bf3f5fc51c91a90cec9a4790fad33f2756616adfc92d32a4e0b11531
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 5256 bytes
SHA-256: 39ac561c71dcb6eaa112b2475b498f84d56a3d11b050c71ad0c94263a36aff72
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 11256 bytes
SHA-256: 6acaa57b5132aa976abbf17ed5e6983042723d1fd5892d9901e93206efbc28be
font_03_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c