Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6d56920bd37047…

MALICIOUS

PDF

76.5 KB Created: 2021-03-21 04:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 73767352fd67c2bf1b27f2c4ab212bc2 SHA-1: ebcaf284927ae8b87436920b6f4db8da6fd094cd SHA-256: 1d6d56920bd37047eb7f4f1f447f4a1a96288c7f1f014bd298a87387afee1426
244 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure. ClamAV also detected this as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=adverbs+of+frequency+table+pdf In PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/zibefukol.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/9086369.pdfIn PDF document text
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/zowosawovetiwi_tugutux_mavilovamag.pdfIn PDF document text
    • https://cdn.sqhk.co/komifugu/idijFPr/besovulesavujokiremen.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/joberowikajozetevotev.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/9jbgdQ8/10987416016.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/retawelufeseweju.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/XiLidie/86221118051.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/41b7237cba4.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/503605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5234fdd-b394-4af8-837e-94ff671aecd8/samsung_50_7_series_vs_8_series.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_6aa849cbca2e47fbb0859fea702ae0cf.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_e2c321e6807144629f22ea0266bd1735.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_4cf3beb8829e4390b63758a9f4e2602d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b038075e-4547-4c9a-9e1c-39cf05718266/tujedefebirovufajepeburu.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/permenkes_46_tahun_2020_akreditasi_puskesmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68a72f2-7c82-436c-8dba-c4e0ad9c363d/gilifotasulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70284001-6dc4-4884-ba49-2ba33b6cc61d/black_and_decker_le750_parts_list.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/journaux_algeriens_gratuit_aujourd_hui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc746dd-bf05-4b2c-9d9a-923d6921f8ef/big_green_egg_cook_pork_chops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bcb7f4-77a4-4e3d-a401-42f3bfadc018/73406251842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48a1761-b492-4601-8b51-60ccecba43d6/31660971786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3d4b0b-66f2-4321-ab8a-3e353c49176b/96243446443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0230c45-b46d-40aa-8dcb-f706b36649d3/vifizoxepewesiruletusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb94ee19-599f-495b-a884-d896d13d0df5/romosowo.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5568 bytes
SHA-256: d3a065a69568edacdcbdcea97d40f65e9ef9294117e5d345063bf2695357bbd3
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11204 bytes
SHA-256: 3bfaf8a91d5da08a7b5efd8b7fc193912898d26b64ed9981effa21f9b3679be8