Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6d71321465028c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-29 07:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 350737571b072ea86ed7a32425b5265a SHA-1: 41d6fe030651cef117173123bfa3ee8f99352b84 SHA-256: 9f6d71321465028cd24fd55612228463b94b9e7bccaea7da623cff1af9b18280
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic to disguise malicious links. It contains numerous links to external domains, many of which appear algorithmically generated or hosted on disposable infrastructure, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download of a second-stage payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=the+room+2+android+download PDF link annotation
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/59935529153.pdfIn PDF document text
    • http://gibisch.com/files/files/nozogalelomaminekaditixib.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vudowuziloxojaner.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/8391070692.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917040115.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zozujoxubiworoguv.pdfIn PDF document text
    • http://sunway.me/uploads/file/132322407401.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/22248975708.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/93833036494.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tavutefatazeligezatovo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/bifibebobutenolet.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/18124329754.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/79389375445.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gagazituwetekebon.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/57263711918.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/gigorogoka.pdfIn PDF document text
    • http://elma1.ru/!upload/files/walijuvepalukakedosu.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/58100922957.pdfIn PDF document text
    • http://ladna.pl/user_images/file/21332917410.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kolalezaledufabivikar.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/72649464195.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wivipoxemekitajon.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://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_off0000aedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDC 13912 bytes
SHA-256: 814cf565282e426874f49fd1f6fdba7f65211e604d0ed2a1797a9252d068420c
font_01_sfnt_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 10416 bytes
SHA-256: 92e9c25175e8ff927529100b5382a92f0514160d86d981ebbdad5e402dbb8aa3
font_02_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1