Malicious PDF — malware analysis report

Static analysis result for SHA-256 1082619315f9d3f5…

MALICIOUS

PDF

97.1 KB Created: 2021-03-16 00:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 105d13df7ee93ee989486d3d4c0a9dd2 SHA-1: aa1f5fbd2b377276fef31be1d2b7e9b9d4f713c4 SHA-256: 1082619315f9d3f50eb308e53b40418f0ec352dcc02d66989d3bba8ef3dc79a5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/wix?keyword=rune+knight+leveling+guide+ragnarok+mobile PDF link annotation
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/bosorepozetit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_6006e64368c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6027ff21e6fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_604e352bea371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5ffe60b5f2304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60174a7ce5ffc.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/5c27fee2c88fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_600f78b0d3096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467915/normal_5ff768019abc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_604819509b076.pdfIn PDF document text
    • https://zokuvulasaxibu.weebly.com/uploads/1/3/5/2/135298812/97cf5fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5feba4ce72a1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/082320bc-2635-494c-be98-3ce8fc82b27c/94181526892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9900e5e5-f7f6-4914-99c9-4f32c0d83643/sword_art_online_novel_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b627df-f1a3-474f-8523-d774450aa781/para_que_sirve_el_jengibre_limon_y_miel.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_527278cfa90949e08932d53601675de9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d8e1ad-d24f-491e-ae24-424771d52268/freud_civilization_and_its_discontents.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_55f7b34b5a48470d848725410b1d6229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca53164-df81-4f1a-b1de-4a997c007807/an_introduction_to_mathematical_reasoning_answers.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_2864f1ac473449639fc94c4589919d09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98534460-2656-4ee9-a15c-59805d486e1a/zolurowumejusixixamediz.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_b613a7310aa2426980e7afb45a7362fa.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 3228 bytes
SHA-256: 1be66a3b16369c3d21d1c0c82d39406cc379625166ce7b347dd2774a9b82447c
font_01_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 5332 bytes
SHA-256: a4f7f370a61d8753c02b3445a38b255aff7dcf1229ee605700958b09c05a1e79
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 9548 bytes
SHA-256: fefa673eeeac080af7c785c093c0c3f1f3bb63b8417d645d22cda12a42013f6b
font_03_sfnt_off00014c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 12160 bytes
SHA-256: 0ef8d753e05022a16befadbc327451b6ce81dcafc23b1d6949db39d6f404c2d7