Malicious PDF — malware analysis report

Static analysis result for SHA-256 43da54657d28c6d2…

MALICIOUS

PDF

91.3 KB Created: 2021-03-28 21:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07704f0fd371401c62d44bba2eab6df5 SHA-1: af92097bdb087bc76f5cfa6cf9deb32e3cab59c8 SHA-256: 43da54657d28c6d26c84b354686ec715827d27179d0f036dd76e518abf40e2af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary URL, https://lozipotod.ru/award?keyword=aneurisma+de+la+aorta+tor%25C3%25A1cica+pdf, suggests a lure related to a medical topic to attract clicks. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=aneurisma+de+la+aorta+tor%25C3%25A1cica+pdf
    • https://static.s123-cdn-static.com/uploads/4374203/normal_5ffbfa05927be.pdf
    • http://all-system7.club/pupuvnr2r6.pdf
    • http://shop-kid-toys.online/jorexewaloribigasenixene6pbby.pdf
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5ffa2ee103c58.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_6053c55d1f10e.pdf
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fd9af3ced3e5.pdf
    • http://ru-en.xyz/mahaan_songs_mymp3song4fpcs.pdf
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6019fd32c47ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tolivajupeku/lagu_rewrite_the_stars_lyrics.pdf
    • https://s3.amazonaws.com/xuzed/58565885517.pdf
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_0d52921a615b44c8bee4c4958f552961.pdf?index=true
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_f09021577dda40f0a006556c57404112.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_8b79d43f8f3f4422b6f4845573a58507.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_7ad815296f354d7c9a97cf7daa9803ff.pdf?index=true
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_750c7b6ed56b4e7a952be28eaef5e92b.pdf?index=true
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_11b0be5d83604852abc10eda3c9ee0ca.pdf?index=true
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_6da8c86033864cf69e6766d9d297102f.pdf?index=true
    • https://s3.amazonaws.com/xoferuzu/nikon_d3500_af-p_dx_18-55mm_vr_camera.pdf
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_00afeecb3d9242248233cdd32b7e037d.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_f8f1bfbfacbe44d2bec059eeab6759f7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001265f.bin
60c1bf7ca57023d5567cd6dd13bdbf0651a5371248283a3b0d13079d237014cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 5524 bytes
font_01_sfnt_off00013885.bin
83a762be2f9de916ce03dfb5c2180c8ed2afe1a8eeec41fa8533cc5b4c2098ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 11592 bytes

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