Malicious PDF — malware analysis report

Static analysis result for SHA-256 258af2a520800f35…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f4f9cda1a64d1b4346f22b612b724e6 SHA-1: df01ba339d2e3f4298dcdcd6002ee8acbb070674 SHA-256: 258af2a520800f353f4c3ac40c8dfeff056531988a7f6ff9cad712c016a22d5c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('bologen.ru') that is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent. The presence of embedded links and the nature of the heuristics suggest this file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=garcilaso+de+la+vega+soneto+xxiii+parafrasi
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/fekajesep.pdf
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/5674223.pdf
    • http://canlisohbetim.net/how_to_drain_a_maytag_neptune_washer2z39x.pdf
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/8350117.pdf
    • https://static.s123-cdn-static.com/uploads/4447085/normal_5fd02b33b3211.pdf
    • http://mazers.fun/foduzuvarijunukigzpfe.pdf
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/dd2fd098ac379.pdf
    • https://cdn-cms.f-static.net/uploads/4390385/normal_600ecb63c65b4.pdf
    • http://twirlini.com/college_football_predictions_this_week_bleacher_reportyjo14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_373f3ef6d52343be9c40a0e081ee09d4.pdf?index=true
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_547f5c3cc1974b14a95d87d5d935806c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/362629f3-4314-497d-ae2f-9ea4e2b9f96e/how_to_lose_weight_with_vegetarian_food.pdf
    • https://uploads.strikinglycdn.com/files/8372e1ae-b447-4e0e-991b-0a7317d11d6a/to_the_woman_i_once_loved_free_online.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_447989d5da6242efb82619610097e8d4.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_aa954ffdf11c485eb05c8fd734ff42c4.pdf?index=true
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_d8fe968650424d9fa67c6ca9822165c0.pdf?index=true
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_62cf870a311e46d0b6d3d4fee375fec6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac6886e8-6b45-4bf7-b016-459cc2901a1c/yoga_poses_for_weight_loss.pdf
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_20ba74b76c30489b9fae2eb87e3c1917.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3dbc2554-a7f3-48bb-a70f-b1e1037deb33/54319406375.pdf
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_c1729706cacd48e18c9f933284715c9a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f319.bin
50b1a89465b7efb53e23c774b4528ce743aa9602d0f8842183df07d4e00485de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 5268 bytes
font_01_sfnt_off00010521.bin
bf091bc9ebfc89dcd5fc2f9c94fbf6b6c37cb6803275559a0223e721b2470232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 11396 bytes
font_02_sfnt_off00012a4e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 4324 bytes

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