Malicious PDF — malware analysis report

Static analysis result for SHA-256 0012957a52533620…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 04:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 616e4630a50629d04d6af89c5274fddc SHA-1: 149479f388ec73267f463557a83c932cb308eb9b SHA-256: 0012957a5253362047f37f7762576c711b669dff719d1c5262b508f3774e273c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which are identified as disposable. One heuristic specifically flags the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cheesykeju.com/contents/files/31909491079.pdf In PDF document text
    • http://cuacuonbinhduong.com/upload/files/kozugerugategenifima.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jofukakosekuvunegebaba.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/78613518047.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jozugaz.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/22291405104.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/16376511328.pdfIn PDF document text
    • http://keyday.ru/files/files/kubijapovan.pdfIn PDF document text
    • https://best-label.com/upload/files/kivipikewonizonowuminelop.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/44731422803.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/rokafovogudateva.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xunaxinajozejema.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zapitemulumerusazu.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/44890554175.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/54022261246.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/8650205694.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/30018260773.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2bb35a16---dubadorexopuvamumegis.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/dukimasisu.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/28362312280.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/34393674545.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/27381736671.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7c4d021dc33ce3cbf8217823e97e71f4/wabamometanovebovekajede.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912140404.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/79314094007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=8+pool+hack+iphonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 19568 bytes
SHA-256: 2573443c0348f12a6f1e47f7eb5ceb7b22ebf4e944eb2b28f09aac9894cb7028
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 10308 bytes
SHA-256: dbd5f622224cc086ff8f9fe7633c7ed4dff0a555fcf1971eb0bb64c53b33b8ed