Malicious PDF — malware analysis report

Static analysis result for SHA-256 407b10c6a2992f18…

MALICIOUS

PDF

87.1 KB Created: 2021-02-19 13:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a56d1028ad68a3c3cd5d93528d10062 SHA-1: 791a96d18d615e5961f153804eccb5118466a062 SHA-256: 407b10c6a2992f184895df2b784fcb0e6ff7f1613c9ec3f91c89bbecff1ddec8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=solving+quadratic+equations+by+graphing+and+factoring PDF link annotation
    • http://reduslimitaly-ufficiale.site/ihss_telephone_timesheet_system_phone_numberenlk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5fe083b36cfb3.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/255533.pdfIn PDF document text
    • http://redit.fun/how_fast_can_a_tesla_model_3_long_range_go2umcv.pdfIn PDF document text
    • http://ejqy.com/76033081406k51r9.pdfIn PDF document text
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/jeramunog_janabuzuri.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/ab0de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601e38a4011fc.pdfIn PDF document text
    • http://intekzafast.online/294171883303kirx.pdfIn PDF document text
    • https://mepotogi.weebly.com/uploads/1/3/4/7/134737672/niderubebesedopukowa.pdfIn PDF document text
    • http://good-production17.site/malibu_transformer_timer_not_working4b10j.pdfIn PDF document text
    • http://dezlice.ru/40986935218mibis.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/transcendental_meditation_mantras_lilgi0n.pdfIn PDF document text
    • http://bas-vorota.ru/kanji_practice_sheetsn3l54.pdfIn PDF document text
    • http://zufuruz.22web.org/android_room_update_doesn_t_work.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipapexof.rf.gd/arseni_tarkovski_poemas.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/23101273975.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/timuz.pdfIn PDF document text
    • http://setiwol.epizy.com/4945837238.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/halloween_crossword_puzzle_worksheet.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ead7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAD7 14880 bytes
SHA-256: 25dfbd2b24b4f4e67a5d2bd3dfddf3e126e92571bcf3787943c94a98c2ca4258
font_00_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 5948 bytes
SHA-256: 5b20ce6f9d66b54973f62e7edcf26e5b2f58f45a218fc1953ab13da0210e13f6
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10676 bytes
SHA-256: 919d3dacc9213fbf8ac5247cf59d7c9c07ed08a855c81ef220f341fe1494a74c
font_03_sfnt_off0001392e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392E 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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