Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13de7c1fdf3c3c3…

MALICIOUS

PDF

77.9 KB Created: 2020-12-17 02:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177c923ec394355602d6ae592df9604f SHA-1: 1b1eb405ab021877b74dcb9a85db5ff8c183cd89 SHA-256: e13de7c1fdf3c3c34c6cbfe165a26adb994b074799cb7533b78c412177aa5a27
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. One of the primary links points to 'trafftec.ru', which is suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=formosan+aboriginal+culture+village+amusement+park
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/1473619.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/gegaragadipiwu_xizirukoxebevev_dorefafobit_witeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pewebopufupe/amazing_bible_timeline_download.pdf
    • https://s3.amazonaws.com/mejigavukolu/fipazujupitilalaga.pdf
    • https://s3.amazonaws.com/roware/nojezeleve.pdf
    • https://s3.amazonaws.com/baposivarabuj/pevulasidi.pdf
    • https://s3.amazonaws.com/mesotodimus/91634144018.pdf
    • https://s3.amazonaws.com/nigimul/62607990817.pdf
    • https://static1.squarespace.com/static/5fc3a0e816f6d44b07cfb956/t/5fc82afa2dd5737571a9e958/1606953723750/free_solitaire_no_ads_for_pc.pdf
    • https://s3.amazonaws.com/bokofapig/kindle_format_to.pdf
    • https://s3.amazonaws.com/kuxuxemu/20612467417.pdf
    • https://s3.amazonaws.com/kiwopusafize/relative_key_chart.pdf
    • https://static1.squarespace.com/static/5fc2a453cd1e280355df5d9e/t/5fc400103f75b16643502785/1606680592893/73984394258.pdf
    • https://static1.squarespace.com/static/5fc59785d49dd12447543100/t/5fd01eac3364176a125074ca/1607474860747/top_10_best_movies_of_the_rock.pdf
    • 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
stream_003_off0000d67b.bin
23cf0ea562c14138fc006cea47405b33c47f066762a5978e6d76255527594a98		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD67B 8628 bytes
font_01_sfnt_off0000f2ea.bin
f4d6e46747b48b7776b7faf0fde7661e35eddc5d06fb19ebd8f1b5430f6b0503		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5472 bytes
font_02_sfnt_off0001057e.bin
16f04d7cc17b54ec417a9f4d0fe835878fadee9b3b40e70322b9aca688d93887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10656 bytes

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